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27/08/2022
Question 1Given that in a one-tail test you cannot reject Ho, can you reject Ho in a two-tail test at the same a?AnswerYesNoMaybe1 points Question 2For a sample size of n = 100 and σ = 10, we want to test the hypothesis H0: μ = 100. The sample mean is 103. The test statistic isAnswer1.6451.9603.0000.3001 points Question 3Which of the following is incorrect?AnswerThe level of significance is the probability of making a Type I errorLowering both a and b at once will require higher sample sizeThe probability of rejecting a true null hypothesis increases as n increasesWhen Type I error increases, Type II error must decrease, ceteris paribus1 points Question 4In hypothesis testing, Type I error isAnswerSet at 5 percentSmaller than or equal to 5 percentThe probability of rejecting H0 when H0 is trueThe probability of rejecting H0 when H1 is true1 points Question 5Given a normal distribution with σ = 3, we want to test the hypothesis H0: μ = 20. We find that the sample mean is 21. The test statistic isAnswer1.0001.6451.960Impossible to find without more information1 points Question 6The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it. A trial sample of 25 employees shows that 16 are dissatisfied. For a right-tailed test, the test statistic would beAnswer1.2271.3751.4001.1151 points Question 7A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the critical value to test whether the mean transaction time exceeds 60 seconds at a = .01.Answer2.9472.6022.5832.3331 points Question 8As you are crossing a field at the farm, your country cousin Jake assures you “Don’t worry about that old bull coming toward us. He’s harmless.” As you consider Jake’s hypothesis, what would be Type I error on your part?AnswerYou will soon feel the bull’s hornsYou will run away for no good reasonJake will not have any more visits from you1 points Question 9Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percent has risen, the p-value is approximatelyAnswer.0501.0314.0492.00361 points Question 10Which statement about a is not correct?AnswerIt is the probability of committing a Type I errorIt is the test’s significance levelIt is the probability of rejecting a true H0
It is equal to 1-bGiven that in a one-tail test you cannot reject Ho, can you reject Ho in a two-tail test at the same a?AnswerYesNoMaybe1 points Question 2For a sample size of n = 100 and σ = 10, we want to test the hypothesis H0: μ = 100. The sample mean is 103. The test statistic isAnswer1.6451.9603.0000.3001 points Question 3Which of the following is incorrect?AnswerThe level of significance is the probability of making a Type I errorLowering both a and b at once will require higher sample sizeThe probability of rejecting a true null hypothesis increases as n increasesWhen Type I error increases, Type II error must decrease, ceteris paribus1 points Question 4In hypothesis testing, Type I error isAnswerSet at 5 percentSmaller than or equal to 5 percentThe probability of rejecting H0 when H0 is trueThe probability of rejecting H0 when H1 is true1 points Question 5Given a normal distribution with σ = 3, we want to test the hypothesis H0: μ = 20. We find that the sample mean is 21. The test statistic isAnswer1.0001.6451.960Impossible to find without more information1 points Question 6The Melodic Kortholt Company will change its current health plan if at least half the employees are dissatisfied with it. A trial sample of 25 employees shows that 16 are dissatisfied. For a right-tailed test, the test statistic would beAnswer1.2271.3751.4001.1151 points Question 7A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the critical value to test whether the mean transaction time exceeds 60 seconds at a = .01.Answer2.9472.6022.5832.3331 points Question 8As you are crossing a field at the farm, your country cousin Jake assures you “Don’t worry about that old bull coming toward us. He’s harmless.” As you consider Jake’s hypothesis, what would be Type I error on your part?AnswerYou will soon feel the bull’s hornsYou will run away for no good reasonJake will not have any more visits from you1 points Question 9Last year, 10 percent of all teenagers purchased a new iPhone. This year, a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone. To test whether the percent has risen, the p-value is approximatelyAnswer.0501.0314.0492.00361 points Question 10Which statement about a is not correct?AnswerIt is the probability of committing a Type I errorIt is the test’s significance levelIt is the probability of rejecting a true H0It is equal to 1-b
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