Concept explainers
For Exercises 1 through 12, use the Kruskal-Wallis test and perform these steps.
a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.
6. Job Offers for Chemical Engineers A recent study recorded the number of job offers received by randomly selected, newly graduated chemical engineers at three colleges. The data are shown here. At α = 0.05, is there a difference in the average number of job offers received by the graduates at the three colleges?
College A | College B | College C |
6 | 2 | 10 |
8 | 1 | 12 |
7 | 0 | 9 |
5 | 3 | 13 |
6 | 6 | 4 |
Want to see the full answer?
Check out a sample textbook solutionChapter 13 Solutions
ELEMENTARY STATISTICS W/CONNECT >IP<
Additional Math Textbook Solutions
Essentials of Statistics (6th Edition)
Statistics for Business and Economics (13th Edition)
Elementary Statistics: Picturing the World (7th Edition)
Introductory Statistics
Statistical Techniques in Business and Economics
- You are working for the South Tahoe Tourist Bureau and are interested in determining if there is a relationship between the casino people frequent and the type of gambling that they do at the casino Table Games Slots Sports Harrah’s 50 60 12 Hard Rock 18 22 6 MontBleu 33 29 20 Harvey’s 41 39 20 a. State the null and alternative hypotheses. b. State which hypothesis test should be used. Calculate the p-Value and state the command you entered in the calculator. c. State the conclusion in the context of the problem.arrow_forwardFor each pair of hypotheses that follows, decide whether H₀ and H₁ are set up correctly as the null and alternative hypotheses for a hypothesis test. If so, select “Valid” from the drop down menu. If not, select “Invalid”. 1 H₀: M = 165 2 H₀: μ = 39 H₁: M ≠ 165 H₁: μ ≠ 39 3 H₀: μ = 344 4 H₀: µ = 79 H₁: μ ≠ 344 H₁: µ ≠ 86 You always evaluate the results of an experiment by assessing the .arrow_forwardGiven the situation below, create a problem and determine (a) the null and alternative hypotheses, (b) test statistic, (c) rejection region, and (d) applicability of the CLT.arrow_forward
- State the null and alternative hypotheses to be used in testing the following claims also explain type of test.(a) At most, 20% of next year’s wheat crop will be exported to the Soviet Union.(b) On the average, American homemakers drink 3 cups of coffee per day.(c) The proportion of college graduates in Virginia this year who majored in the social sciences is at least 0.15.(d) The average donation to the American Lung Association is no more than $10.(e) Residents in suburban Richmond commute, on the average, 15 kilometers to their place of employmentarrow_forwardYou are given the following hypotheses H 0 :p=0.3 H A :p not equal 0.3 We know that the sample size 90. For what sample proportion would the pvalue be equal to 0.1? Assume that all conditions necessary for Inference are satisfied.arrow_forwardThe P-value for a hypothesis test is P = 0.034. Do you reject or fail to reject H 0 when the level of significance is α = 0.01?arrow_forward
- A dental assistant is interested in the proportion of patients that need a root canal. Let the proportion of patients that need a root canal be p. If the dental assistant wanted to know if the proportion of patients that need a root canal is more than 20%, what are the null and alternative hypotheses? Select the correct answer below: H0: p=0.20; Ha: p<0.20 H0: p>0.20; Ha: p=0.20 H0: p=0.20; Ha: p>0.20 H0: μ=0.20; Ha: μ>0.20arrow_forwardname the appropriate inference procedure, and write the hypotheses. DO NOT ACTUALLY WORK OUT THESE FIRST 4 PROBLEMS. there are 2 bacteria this chart applies to both Specimen 1 2 3 4 5 6 7 8 Method A 22.7 23.6 24.0 27.1 27.4 27.8 34.4 35.2 B 23.0 23.1 23.7 26.5 26.6 27.1 33.2 35.0 Bacteria 1 Investigators at the U.S. Department of Agriculture wished to compare methods of determining the level of bacterial contamination in beef. Two different methods (A and B) of determining the level of contamination were used on each of eight randomly selected specimens of a certain type of beef. The data obtained, in millimicrobes/liter of ground beef, for each of the methods are shown in the table below. Bacteria 2 Investigators at the U.S. Department of Agriculture wished to compare methods of determining the level of bacterial contamination in beef. Two different methods (A and B) of determining the level of contamination were tested. Sixteen randomly selected specimens of a certain type…arrow_forwardPlease show work, and show all parts of the hypothesis too, with the conclusion that was reached about her beliefarrow_forward
- Use the five steps in the hypothesis testing procedure for each answer. 1 ) A national publishing house claims that 45% of all weekly magazine readers in South Africa read their publication. Test this claim at the 5% significance level, if a survey found that 205 out of a random sample of 500 magazine readers said that they read the relevant publication.arrow_forward(b)Based on your answer to part (a), which statement below is true? Since the p-value is less than (or equal to) the level of significance, the null hypothesis is rejected. Since the p-value is less than (or equal to) the level of significance, the null hypothesis is not rejected. Since the p-value is greater than the level of significance, the null hypothesis is rejected. Since the p-value is greater than the level of significance, the null hypothesis is not rejected.arrow_forwardPlease answer the three empty boxes and "Perform a paired t test. Let μ1 be the population mean adindex rating for cola A and let μ2 be the population mean adindex rating for cola B. What are the null and alternative hypotheses?"arrow_forward
- MATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th...StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C...StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage Learning
- Elementary Statistics: Picturing the World (7th E...StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. Freeman