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. Two-tailed tests ________. (Points : 1)...

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. Two-tailed tests ________. (Points : 1) have only lower critical values have only upper critical values have both upper and lower critical values do not have any critical values Question 2. 2. Hypothesis testing always assumes that ________. (Points : 1) the alternative hypothesis is true the null hypothesis is true the 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 true probability of incorrectly rejecting the null hypothesis when it is actually true probability of incorrectly failing to reject the null hypothesis when it is actually false probability of correctly rejecting the null hypothesis when it is indeed false Question 4. 4. The power of the test has a value of ________. (Points : 1) 1 - a 1 + ? 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 data describes an existing theory or belief that is accepted as correct in the absence of contradictory data is based on new information provided by sample data is based on new information provided by population data Question 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. 36.73 35.50 25.92 38.36 41.65 25.50 18.78 19.78 33.14 22.22 20.85 26.23 22.13 32.33 28.46 34.15 34.72 24.21 24.20 28.95 21.84 19.74 20.75 Which 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) population sample test statistic t-distribution Question 8. 8. The t-Test Statistic has a t distribution with ________ degrees of freedom. (Points : 1) n n + 1 n - 2 n - 1 Question 9. 9. The confidence coefficient is ________. (Points : 1) the probability of correctly failing to reject the null hypothesis the probability of making a Type II error the probability of making a Type I error the probability of correctly rejecting the null hypothesis Question 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 > $2.00 H1: mean production costs < $2.00 H1: mean production costs = $2.00 H1: mean production costs ? $2.00 Question 11. 11. If the null hypothesis is false, it is more likely that the test statistic will ________. (Points : 1) fall into the nonrejection region not follow the uniform distribution fall into the rejection region not follow the normal distribution Question 12. 12. The hypothesized sampling distribution of the test statistic is divided into ________ parts. (Points : 1) four two six three Question 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-test ANOVA paired samples t-test F-test Question 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. Females Males Number of managers 18 23 Sample size 45 75 Identify the p-value. (Points : 1) 0.1483 0.2966 0.8517 0.7034 Question 15. 15. If the confidence coefficient is 0.9, ________. (Points : 1) we expect that 9 samples out of 100 will support the null hypothesis we expect that 90 out of 100 samples will support the null hypothesis we expect that 10 samples out of 100 will support the null hypothesis we expect that all 100 samples will support the null hypothesis Question 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 guilty better safe than sorry. the theory of relativity the central limit theorem Question 18. 18. The power of the test depends on ________. (Points : 1) the true value of the population mean the level of confidence used the sample size all of the above Question 19. 19. Statistical inference is the process of drawing conclusions about ________ from sample data. (Points : 1) surveys populations individuals sampling errors Question 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. 36.73 35.50 25.92 38.36 41.65 25.50 18.78 19.78 33.14 22.22 20.85 26.23 22.13 32.33 28.46 34.15 34.72 24.21 24.20 28.95 21.84 19.74 20.75 Which of the following is the critical value using a level of significance of 0.05? (Points : 1) 1.717 -1.717 1.7139 -2.0739

 

Paper#11753 | Written in 18-Jul-2015

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