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Question 15 of 20 1.0/ 1.0 Points Click to see additional instructions The CEO of a software company is committed to expanding the proportion of highly qualified women in the organization’s staff of salespersons. He believes that the proportion of women in similar sales positions across the country is less than 45%. Hoping to find support for his belief, he directs you to test H0: p f$geq f$ .45 vs H1: p < .45. In doing so, you collect a random sample of 50 salespersons employed by his company, which is thought to be representative of sales staffs of competing organizations in the industry. The collected random sample of size 50 showed that only 18 were women.
Compute the test value that you would use in conducting this test. Place your answer, rounded to 3 decimal places, in the blank. For example, -2.345 would be a legitimate entry. -1.279
Question 16 of 20 1.0/ 1.0 Points Click to see additional instructions A statistician wishes to test the claim that the standard deviation of the weights of firemen is greater than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 27.2 pounds. Assuming that the weights of firemen are normally distributed, to test her research hypothesis the statistician would use a chi-square test. In that case, what is the computed test value? Place your answer, rounded to 3 decimal places, in the blank. For example, 23.456 would be a legitimate entry. 22.491
Question 17 of 20 1.0/ 1.0 Points Click to see additional instructions A statistician wishes to test the claim that the standard deviation of the weights of firemen is less than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 23.2 pounds. Assuming that the weights of firemen are normally distributed, if the statistician wanted to test her research hypothesis at the .05 level of significance, what is the critical value? Place your answer, rounded to 3 decimal places, in the blank. For example, 12.345 would be a
Answer Key: 10.117 Part 3 of 3 - 3.0/ 3.0 Points Question 18 of 20 1.0/ 1.0 Points If a null hypothesis about a population mean is rejected at the 0.025 level of significance, then it must also be rejected at the 0.01 level. True False Answer Key: False
Question 19 of 20 1.0/ 1.0 Points If a null hypothesis about a population proportion p is rejected at the 0.025 level of significance, then it must also be rejected it at the 0.05 level.
Question 20 of 20 1.0/ 1.0 Points An alternative or research hypothesis is usually the hypothesis a researcher wants to prove.

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