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STATS & Probability Test Quiz

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Question;Question 1. 1. Two-tailed tests ________. (Points: 1)have only lower critical valueshave only upper critical valueshave both upper and lower critical valuesdo not have any critical valuesQuestion 2. 2. Hypothesis testing always assumes that ________. (Points: 1)the alternative hypothesis is truethe null hypothesis is truethe probability of the null hypothesis being true is less than 50%the probability of the alternative hypothesis being true is less than 50%Question 3. 3. The power of the test represents the ________. (Points: 1)probability of correctly failing to reject the null hypothesis when it is indeed trueprobability of incorrectly rejecting the null hypothesis when it is actually trueprobability of incorrectly failing to reject the null hypothesis when it is actually falseprobability of correctly rejecting the null hypothesis when it is indeed falseQuestion 4. 4. The power of the test has a value of ________. (Points: 1)1 - a1 + ?1 - ?a - ?Question 5. 5. The null hypothesis ________. (Points: 1)describes an existing theory or belief that is accepted as correct in the presence of contradictory datadescribes an existing theory or belief that is accepted as correct in the absence of contradictory datais based on new information provided by sample datais based on new information provided by population dataQuestion 6. 6.Use the information below to answer the question.The following table provides data on a sample of customers who visited a local restaurant. The restaurant owner believes that the average profit per customer exceeds $25.36.7335.5025.9238.3641.6525.5018.7819.7833.1422.2220.8526.2322.1332.3328.4634.1534.7224.2124.2028.9521.8419.7420.75Which of the following is the correct conclusion? (Points: 1)The null hypothesis that the average profit per customer exceeds $25 cannot be rejected.The null hypothesis that the average profit per customer does not exceed $25 is rejected.The null hypothesis that the average profit per customer does not exceed $25 cannot be rejected.The null hypothesis that the average profit per customer exceeds $25 is rejected.Question 7. 7. In most practical applications, the population standard deviation will not be known but it is estimated from the ________. (Points: 1)populationsampletest statistict-distributionQuestion 8. 8. The t-Test Statistic has a t distribution with ________ degrees of freedom. (Points: 1)nn + 1n - 2n - 1Question 9. 9. The confidence coefficient is ________. (Points: 1)the probability of correctly failing to reject the null hypothesisthe probability of making a Type II errorthe probability of making a Type I errorthe probability of correctly rejecting the null hypothesisQuestion 10. 10. Which of the following is not an appropriate alternative hypothesis for the null hypothesis, H0: mean production cost = $2.00? (Points: 1)H1: mean production cost > $2.00H1: mean production costs < $2.00H1: mean production costs = $2.00H1: mean production costs? $2.00Question 11. 11. If the null hypothesis is false, it is more likely that the test statistic will ________. (Points: 1)fall into the nonrejection regionnot follow the uniform distributionfall into the rejection regionnot follow the normal distributionQuestion 12. 12. The hypothesized sampling distribution of the test statistic is divided into ________ parts. (Points: 1)fourtwosixthreeQuestion 13. 13. To assess the effect of an intervention such as the productivity of an employee before and after a training class, one would conduct a(n) ________. (Points: 1)independent samples t-testANOVApaired samples t-testF-testQuestion 14. 14.Use the below information to answer the question.A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees.FemalesMalesNumber of managers1823Sample size4575Identify the p-value. (Points: 1)0.14830.29660.85170.7034Question 15. 15. If the confidence coefficient is 0.9, ________. (Points: 1)we expect that 9 samples out of 100 will support the null hypothesiswe expect that 90 out of 100 samples will support the null hypothesiswe expect that 10 samples out of 100 will support the null hypothesiswe expect that all 100 samples will support the null hypothesisQuestion 16. 16. The probability of making a Type I error is generally denoted by ________. (Points: 1)a???Question 17. 17. A helpful analogy of hypothesis testing might be the concept of ________. (Points: 1)the U.S. legal system-innocent until proven guiltybetter safe than sorry.the theory of relativitythe central limit theoremQuestion 18. 18. The power of the test depends on ________. (Points: 1)the true value of the population meanthe level of confidence usedthe sample sizeall of the aboveQuestion 19. 19. Statistical inference is the process of drawing conclusions about ________ from sample data. (Points: 1)surveyspopulationsindividualssampling errorsQuestion 20. 20.Use the information below to answer the question.The following table provides data on a sample of customers who visited a local restaurant. The restaurant owner believes that the average profit per customer exceeds $25.36.7335.5025.9238.3641.6525.5018.7819.7833.1422.2220.8526.2322.1332.3328.4634.1534.7224.2124.2028.9521.8419.7420.75Which of the following is the critical value using a level of significance of 0.05? (Points: 1)1.717-1.7171.7139-2.0739

 

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