Question: What effect does adding soda to the water have on solution rate? b) Between what tw... An annual survey of first-year college students asks 272,000 students about their attitudes on a variety of subjects. The therapist finds that two relevant studies have been conducted. What is the hypothesis test to be conducted? Clearly, some questions are too trivial and meaningless to bother answering. The distribution of DVDs watched per mont... A plan for an exclusive travelers club has been developed by an airline on the premise that 5% of its current customers would qualify for membership. The vendor wants to know if Starbucks and Dunkin Donuts differ in terms of customers pur... An essential oil manufacturer wants to publish the health benefit of aromatherapy with lavender essential oil. Seventy of the 400 workers surveyed indicated they were worried about losing their job. I asked 10 teachers in my middle school how many times in 2015 they used tobacco and how many times they used alcohol to relax after a difficult day. (c) the p-value. Remember, in order to calculate the median, you must first order the values in the sample from lowest to highest. In the nursing home study regarding influenza outbreaks, they found that 12 out of 34 small nursing houses had a resident... Test the given claim. a. t-test for... ABC Company claims that the proportions of its employees investing in individual investment accounts is higher than the national proportion of 50%. I tested 300 people with a new, inexpensive, non-invasive test to determine if they had been exposed to Zika. The following are the results of his random sampling. The order requires that the bulbs have a mean life span of 500 hours. Why or How questions are best. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs... A hospital claims that the proportion of full-term babies born in the hospital who weigh less than seven pounds is no more than 48% . Feeling skeptical, you question a sample of 9 students who used the tutoring service, finding that their... Find the P value for the indicated hypothesis test with the given standardized test statistic z. deviations fo... A medical school claims that more than 28% of its students plan to go into general practice. Researchers published an article in, ''American Journal of Public Health''. A hypothesis is a possible explanation for observations, or an educated guess about what you think will happen in your experiment. In the following examples, indicate whether you would perform a t-test of independent means or dependent means. From the Baltimore facility, 175 samples were obtained and compared with a sample of 168 from the Burlington facility. This sample had a standard deviation of 0.25. Hypothesis Worksheet 2 / Number Name Date Hour Underline the IV (what is the experimenter changing) and circle the DV (what is being measured) and then write your hypothesis in an "If , then" format. Find the critical and observed values of z for the following test of hypothesis using alpha = 0.05 . Displaying top 8 worksheets found for - Hypothesis Practice. If we hypothesize that the program will increase achievement scores, we are making: a. a null hypothesis b. a two-ta... Find the critical z value used to test a null hypothesis, alpha = 0.05 for a two-tailed test. Hypothesis Practice Worksheet Date:_____! Consider a sample of 45 football games, where 30 of them were won by the home team. H0: mu = 61 HA: mu not equal to 61 alpha = 0.10 a. The dean of students would like to see if there is a significant difference in the ages of resident students and commuter students. 5. State the decision rule in terms of the critical value of the te... For the hypotheses below, test \alpha = 0.025 with n = 100 and \bar{p} = 0.65. C is the correct answer. We want to test whether or not this proportion increased in 2011. A random sample of 30 mail carriers reported their sample mean hours worked per week was 45.5 with a standard deviation of 15.16. The test statistic follows a distribution with the distribution curve shown below. Conduct a test at the 0.05 level of significance by determining (a) the null and alternative hypotheses (b) the test statistic (c) the P-value. Claim the alternative hypothesis is false. Assume the population is normally distributed. Suppose 290 adults in a certain region are randomly surveyed and 158 say they favor a ban. c. Reject the null hypothesis. Independent variable: Dependent variable: B) Ask an issue, evaluate results, create a hypothesis, test the hypothesis, draw conclusions, communicate results. a) We estimate \sigma_2 . The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.7 auto accidents per day with a variance of 0.0036. Which are the two different kinds of mistakes that we can make in a hypothesis test? Does the evidence indicate that the drug improved the amount of REM sleep at a 0.01 level of significance? The Rocky Mountain district sales manager of Rath Publishing Inc., a college textbook publishing company claims that the sales representatives make an average of 39 sales calls per week on professo... A United Nations report shows the mean family income for Mexican migrants to the United States is $27,300 per year. 3. However, the population standard deviation of their ages remains constant of around 2.1 years. ______________________________________________________________________________ (b) Whether a hy... A fast-food restaurant estimates that the mean sodium content in one of its breakfast sandwiches is no. If you are testing a piece of evidence to determine if it is consistent with a fraud case, you are performing a(n) a. Hypothesis test. C) Ask an issue, create a hypothesis, test hypothesis, draw conclusions, evaluate results, communicate results. Question: What effect does stirring have on solution rate? If the populat... Test the claim about the population mean, mu, at the given level of significance, alpha, using the given sample statistics. However, in today's high data output environment, many findings may be examined further after the data is analyzed. At \alpha = 0.06, can the clinic support the claim? Assuming the population is normally distributed, test the claim that the mean is more than 23 using a significance level of 0.05. A company claims that its brands of paint ha... Test the claim that for the adult population of one town, the mean and annual salary is given by mu = 30,000. What is the difference between a one sample and a two sample test? Use the given information to find the P-value. A random sample of 100 employees was sel... Is there any difference between the proportion of Americans who wish they were rich and the proportion of Canadians who wish they were rich? Question: What effect does adding soda to the water have on solution rate? She takes a random sample of 35 such cases from court files and finds that x-bar = 16.7 months... A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a mean different from the 600 mg claimed by the manufacturer. Old Exam Questions-Solutions Hypothesis Testing (Chapter 7) 1. Identify the null and alternative hypotheses, test statistic, critical value(s) or P-value, conclusion about the... A cereal company claims that the mean weight of the cereal in its packets is 14 oz. Based upon collected data, a local car dealer has estimated that the amount spent on extras in cars is normally distributed with an average of $2,200 per customer. Best 25 Scientific method worksheet ideas on Pinterest from Hypothesis Worksheet, According to a recent survey, 53% of first-year students believe that abortion... Use technology and a t-test to test the claim about the population mean mu at the given level of significance alpha using the given sample statistics. Question: What effect does the amount of light have on plant growth? Which of the following is not a requirement for using the t-distribution for a hypothesis test concerning mu. The Medical Rehabilitation Education Foundation reports the average cost of rehabilitation for stroke victims is $24,672. Hypothesis: If soda is added to the water and tablet, then the dissolving rate will be a. For each H_0, me... A researcher wishes to test the claim that the average cost of tuition and fees at a 4-year college less than $7000. Question: What effect does crushing the tablet have on solution rate? The personal director of a large insurance company is interested in reducing the turnover rate of data processing clerks in the first year of employment. Hypothesis 6b:_________________________________________________________________ The principal of a middle school claims that the test scores of the seventh-graders at his school vary less than the best scores of the seventh-graders at a neighboring school, which have a variati... A researcher claims that the amount of acetaminophen in a certain brand of cold tablets have a standard deviation difference from sigma = 3.3 mg claimed by the manufacturer. The manager commits a type I error if he/she is: a. staying with the old style when the new... A manufacturer of flashlight batteries took a sample of 13 batteries from a day's production and used them continuously until they failed to work. Use a 0.05 significance level to test the clai... From Generation to Generation, the mean age when smokers first start to smoke varies. The mean height of a certain kind of plant is 194 centimeters. (a) In hypothesis testing, the value of the test statistic is determined only by the sample statistic and hypothesized parameter value. Since p-value 0.0269 < sig level 0.05, we reject the null hypothesis. Identify the Type I or Type II error for the test. First note that this is a claim about a population PROPORTION. The mean weight of male dancers in a local modern dance company is at most 188 lbs. The company claims that their batteries last at least 1000 hours, on average. Consider the following hypothesis test: Ho: mu = 10 Ha: mu less than 10 A sample of 50 provides a sample mean of 9.46 and a sample standard deviation of 2. a) Using alpha = .05, what is the critica... A random number generator is supposed to produce random numbers that are uniformly distributed on the interval from 0 to 1. In a clinical trial of vaccine, 10,000 children were randomly divided into two groups. solution rate. using the “If…, then… , because…” format provided in the example below. A. Penn State's Department of Statistics wants to know if applicants to its major have SAT-Math scores that are higher than their SAT-Verbal scores. It is known that the mean income for all assembly-line workers with less than 5 years of experience in a large company is $300 per week. The listed values are waiting times (in minutes) of customers at the Jefferson Value Bank, where customers enter a single waiting line that feeds three teller windows. ABC Insurance Company checks police records on 200 randomly selected auto accidents and note... Use a 0.05 significance level to test the researcher's claim. When a decision is made to retain a false null hypothesis, a Type II Error occurs. Assume that non-runners have an average heart rate of 72 beats per minute. 1. B) Ask an issue, evaluate results, create a hypothesis, test the hypothesis, draw conclusions, communicate results. Chicken Delight claims that the mean wait time for an order is 7 minutes or less. True or False: You accept the alternative hypothesis when you reject the. Suppose that the f... 1. If the solution rate is affected by the water temperature, then the hotter the water the faster the Hypothesis 1a:__________________________________________________________________ 5. A study was done to test the claim th... A survey was done to see if the mean age when people start smoking is at least 16 (16 or greater). Claim: mu not... Fancorp (a consulting firm) claims that less than half of franchises are owned by husband-wife team. The results were: | | Men| Women |Number sampled| 500| 500 |Number worried| 360|... ESPN reports that the average income of an NFL players is 1.5 million (1,500,000) with a population standard deviation of $200,000. The founders of a nationwide SAT preparation course claim that graduates of the course score higher, on average, than the national mean. The mean hours per week and std. Create an account to browse all assets today, Statistical Hypothesis Testing Questions and Answers, Biological and Biomedical We use alpha/2 as the comparison with our p-value. Suppose a firm that produces light bulbs wants to know whether it can say that its light bulbs typically last more than 1500 hours. 6.5, 6.6, 6.7, 6.8, 7.1, 7.3... For each of the claims, mention that the types of test should be used (one-tail, two-tail) and set up the null and alternative hypotheses. State conclusions in terms of the null hypothesis as well as in terms of the claim. In a single-sample t-test, the t-statistic indicates the distance of a sample mean from the _____ in terms of estimated standard error units. 5. Once the Do Now is turned in, I pass out the hypothesis, variables and controls worksheet and present the Hypothesis and Variables slideshow. Given a sample size of 225, with a sample mean of 750 and a standard deviation of 30, we perform the following hypothesis test. faster. ______________________________________________________________________________ Part 2. The number of impurities per million particles of water is a measure of the quality of drinking water. You wi... A new drug is created to help people with depression. Six participants agree to take the nutritional supplement. The study reported that of the 3335 children randomly assigned the vaccine, 51 got t... Iron-deficiency anemia is an important nutritional health problem in the United States. Consider the following hypothesis: Ho: mean = 38 H1: mean > 38. Assume a significance level of alpha = 0.05. According to the highest standards, if average impurities are above 15 parts per million, then... A machine that is programmed to package 2.85 pounds of cereal in each cereal box is being tested for its accuracy. Assume the population standard deviation is 6.1 years. Within each pair of children, one... Students at Penn State College of Engineering and Eberly College of Science have debates on who is smarter. During one month, the clinic finds that 110 of 380 patients only has a cold. (b) test-statistic. Heights were measured for a random sample of 19 plants grown while being treated with a particular nutrient. Question: What effect does adding soda to the water have on solution rate? Ho: p = 0.93 Ha: p < 0.93 (claim) If Ho is true and 93% of Americans own a traditional phone, then there is 2.69% chance of getting 454 or less out of 500 in the sample. hypothesis and variable practice worksheet. answer key Name HYPOTHESIS WORKSHEET ANSWERS NOTE The from Hypothesis Worksheet, The more crushed the tablet, the faster the solution rate because more it is broken up, the The mean score on a certain achievement test at the turn of the century was 73. Research Question and Hypothesis Worksheet Read this carefully: This activity seeks to highlight key elements that should appear in a specific and manageable research question (RQ) or hypothesis. In a random sample of 392 U.S. households, 151 say they own a dog. Consider the following hypothesis test: H0: mu less than or equal 12, Ha: mu greater than 12 A sample of 25 provided a sample mean x = 14 and a sample standard deviation s = 4.32. a. Compute the va... ven H0: p = .20 Ha: p .20 A sample of 400 provided a sample proportion p = .175. a. Compute the value of the test statistic (to 2 decimals). If you use a 0.05 level of significance in a two-tail hypothesis test, what decision will you make if z = -1.68? Hypothesis b: If the water is stirred, then the tablet will dissolve faster because stirring increases The average cost of college tuition is $8,500, but an administrator believes it is much higher. In statistics, usually, hypotheses are created before the data is examined. A sample of 50 orders revealed a mean wait time of 7.2 times. Of these sample members, 28 agreed that the interviewer usually expects the interviewee... H1: The mean of sample A is significantly different than the mean of sample B. The Human Resources Department claims that 54% of the employees prefer a four-day work week. Which of the following in the late 19th century was predicted by the asset-specificity hypothesis? If a researcher performs Hypothesis Testing with alpha level of 0.05, what is the probability that true null hypothesis will be accepted? Question: Scientific Method Worksheet Answer The Following Questions. Want to read all 0 pages? The A recent newspaper article stated that the average college student works at least 31.2 hours per week. Farmers have discovered that more domestic chickens peck at objects placed in their environment, the healthier and more productive the chickens seem to be. In an article appearing in ''Today's Health,'' a writer states that the average number of calories in a serving of popcorn is 75. ______________________________________________________________________________ On a right-tailed hypothesis test with a 1.39 critical value, the collected sample's test statistic is calculated to be 1.41. Suppose a tutoring company advertises that its clientele average 80% in their math courses. However, we believe that a stay of 6.5 days is too low. Out of a random sample of... What area of statistics does hypothesis testing fall under, descriptive or inferential? The production manager at Bellevue, a manufacturer of wheelchairs, wants to compare the number of defective wheelchairs produced on the day shift with the number on the afternoon shift. ______________________________________________________________________________ In a random sample of 700 adults... A small pilot study is conducted to investigate the effect of a nutritional supplement on total body weight. A researcher claims that the proportion of auto accidents that involve teenage drivers is less than 20%. Generic Proportion Null Hypothesis example: Two proportions: proportion of group 1 is = proportion of group... Serum ferritin is used in diagnosing iron deficiency. Assume a normal distribution. Cloud seeding has been studied for many decades as a weather modification procedure (for an interesting study of this subject, see the article in Technometrics, "A Bayesian Analysis of a Multiplica... A hypothesis is being tested at alpha = 0.05 At what event would the null hypothesis be rejected? If the solution rate is affected by crushing the tablet, then the more crushed the tablet the faster The sample mean was 407 and the sample standard devia... A dance instructor is interested in whether the music tempo affects dance performance. n = 56, x bar = 77.04, s = 6.80. b. According to a recent survey, 52% of first-year students believe that abortion... Use a t-test to test the claim about the population mean mu at the given level of significance alpha using the given sample statistics. A simple random sample of 37 franchise owners shows that 12 are owned by husband-wife team. Find and interpre... Do runners have low heart rates, on average? The party affiliations of the respondents were also... A shipping company claims that the average delivery time for its next day. Types: Study Guides, Worksheets, Homework. Which of the following is true about the hypothesis test? Assume the population is normally distributed. Question: What effect does the amount of water have on plant growth? ______________________________________________________________________________ Ag Science: HYPOTHESIS WORKSHEET ANSWERS. Remember, in order to calculate the median, you must first order the values in the sample from lowest to highest. Clarify any vague words. If we know the shaded area is 0.03, then we have suffici... A STAT 200 instructor teaches two classes. The file FastFood contains the amount that a sample of 15 customers spent for lunch($) at a fast-food restaurant: \begin{matrix} 7.42 & 6.29 & 5.83 & 6.50 & 8.34 & 9.51 & 7.10 & 6.80 & 5.90\\ 4.89... A sample of 40 IWU freshmen had a mean GPA of 2.8 over all their courses taken in their first semester at IWU. C is the correct answer. Claim the null hypothesis is true. Hypothesis: _____ _____ Part 2. Conduct the following test of hypothesis using the 0.05 signific... Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys can. State whether the standardized test statistic t indicates that you should reject the null hypothesis. The hypothesis attempts to answer the research question. Since many North Americans apparently have an insatiable craving for chocolate or some other food, psychologists are designing scientific studies to examine the phenomenon. When do you reject or fail to reject the null hypothesis? The quality-control manager for the manufacturer is concerned that the pack may not be wo... A company's current supplier of casting for a permanent magnet motor has a critical diameter dimension measure of an average of 32 millimeters. The sample mean is 2.67. The standard deviation is 1 minute. A survey of 40 s... A statistics instructor claims that 60% of students that take her Elementary Statistics class go through life feeling more enriched. The null and alternative hypotheses are: H_0: p_1 p_2 greater than or equal 0, H_1: p_1 p_2 greater than 0 A sample of 100 observation from the first population indicated that X1 is 70.