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3 Blackboard X A *Question Completion Status: O d) 0.0228 O a) 0.9537 O b) 0.6687 QUESTION 3 2. Assume a population has a distribution with a mean of 100 and a standard deviation of 10. For a sample of size 50, find P(99 0 the test statistic is 3.6, the critical value is 3.365, and the conclusion is to reject Ho- The hypotheses are Ho: 6 = 0, H1: 6 > 0, the test statistic is 3.365, the critical value is 3.6, and the conclusion is to fail to reject Ho- The hypotheses are Ho: J = 0, H1: u > 0, the test statistic is 3.365, the critical value is 3.6, and the conclusion is to fail to reject Ho- The hypotheses are Ho: 6 = 0, H1: 6 > 0, the test statistic is 3.6, the critical value is 3.365, and the conclusion is to reject Ho. QUESTION 16 15. A study has been done to test the effect of classical music on the brain. Twenty sixth-grade students were randomly divided into two groups of 10 students. Then the same math test was given to these students. The first group of students listened to classical music for 20 minutes right hefore taking the test and the other aroun took the test without listening to the music to save all answers. ive All AnswersA Question Completion Status: right before taking the test, and the other group took the test without listening to the music. The scores are given below. Group with music: 91, 77, 58, 89, 83, 78, 74, 81, 91, 88 Ave = 81.0 SD = 10.1 Group without music: 81, 65, 69, 69, 67, 61, 67, 87, 64, 81 Ave = 71.1 SD = 10.1 Consider a test to see if the students who listened to classical music before the test scored higher than the other group of students using a = 0.05. What is the correct test to use? O A two sample proportion test. O A two sample t-test with unequal variances A two sample t-test with equal variances O A two sample z-test QUESTION 17 16. A factory manager wants to determine the average time it takes to finish a certain process by workers, and he wants to test it with randomly selected workers. He wants to be able to assert with 99% confidence that the mean of his sample is off by at most 1/2 minute. If the population standard deviation is 3.2 minutes, how large of a sample must he take? Choose the closest answer O 12 O 273 69 O 286 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers MacBook AirA Question Completion Status: All of the above are correct QUESTION 7 6. A political party conducted an election poll for its presidential candidate to see if he was favored by a majority of voters. In a sample of 500 voters, 272 of them supported this candidate. Determine the null and alternative hypotheses O Ho: p 0.5 O Ho: p > 0.5 vs HI: p 0.5 O Ho: p = 0.5 vs HI: p 10 O Ho: H 2 10 versus H1: H 0, the test statistic is 3.6, the critical value is 3.365, and the conclusion is to reject Ho- QUESTION 16 15. A study has been done to test the effect of classical music on the brain. Twenty sixth-grade students were randomly divided into two groups of 10 students. Then the same math test was given to these students. The first group of students listened to classical music for 20 minutes right before taking the test, and the other group took the test without listening to the music. The scores are given below. Group with music: 91, 77, 58, 89, 83, 78, 74, 81, 91, 88 Ave = 81.0 SD = 10.1 Group without music: 81, 65, 69, 69, 67, 61, 67, 87, 64, 81 Ave = 71.1 SD = 10.1 Consider a test to see if the students who listened to classical music before the test scored higher than the other group of students using a = 0.05. What is the correct test to use? A two sample proportion test. A two sample t-test with unequal variances A two sample t-test with equal variances O A two sample z-test QUESTION 17 16. A factory manager wants to determine the average time it takes to finish a certain process by workers, and he wants to test it with randomly selected workers. He wants to be able to assert with 99% confidence that the mean of his sample is off by at most 1/2 minute. If the population standard deviation is 3.2 minutes, how large of a sample must he take? Choose the closest answer Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers3 Blackboard X A Question Completion Status: QUESTION 9 8. A factory manager wants to determine the average time it takes to finish a certain process by workers, and he wants to test it with randomly selected workers. He wants to be able to assert with 95% confidence that the mean of his sample is off by at most 1 minute. If the population standard deviation is 3.2 minutes, how large of a sample must he take? O 40 ONone of these O 28 O 69 QUESTION 10 9. Suppose that 67 murders were studied and it was found that 10 were committed by women. Construct a 90% confidence interval for the true proportion of murders in New York committed by women. O (0.037, 0.261) O None of these (0.077, 0.221) O (0.064, 0.234) QUESTION 11 owed that their average score was 186. The standard deviation of the sample is 6, and the scores are normallyX A * Question Completion Status: The critical value is z - 1.96 and the test value z = 1.335 so we reject Ho The critical value is z = 2.33 and the test value z = 1.28 so do not reject Ho- The critical value is z = 1.65 and the test value z = 1.335 so do not reject Ho . The critical value is z = 1.28 and the test value z = 1.335, so we reject Ho- QUESTION 13 12 A survey on computers requiring repairs within two years was conducted. 21 out of 200 computers from company A, and 37 out of 200 computers from company B required repairs. Do these data show that computers from company A are more reliable than computers from company B. Test using a = 0.01. Which of the following are true? The data shows that Computers from company A are not more reliable than computers from company B using a = 0.01. There is not enough information to determine which is more reliable. The data shows that Computers from company A are more reliable than computers from company B using a = 0.01. The data shows that Computers from company A are more reliable than computers from company B but only if we use a = 0.001. QUESTION 14 13. A biologist was interested in determining whether sunflower seedlings treated with an extract from Vinca minor roots resulted in a lower average height sunflower seedlings than the standard height of 15.7 cm. The biologist treated a random sample of n = 33 seedlings. The biologist's hypotheses are: HO : M = 15.7 HA : H