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Suppose a university advertises that its average class size is 33 or less. A student organization is concerned that budget cuts have led to increased class sizes and would like to test this claim. A random sample of 41 classes was selected, and the average class size was found to be 35.7 students. Assume that the standard deviation for class size at the college is 8 students. Using a = 0.10, complete parts a and b below. *** a. Does the student organization have enough evidence to refute the college's claim? Determine the null and alternative hypotheses. Ho: HS33 H₁: H > 33 2-

The z-test statistic is ( (Round to two decimal places as needed.) The critical z-score(s) is(are) (Round to two decimal places as needed. Use a comma to separate answers as needed.) Because the test statistic is less than the critical value, b. Determine the p-value for this test. The p-value is (Round to three decimal places as needed.) do not reject the null hypothesis.

A pizza place recently hired additional drivers and as a result now claims that its average delivery time for orders is under 46 minutes. A sample of 40 customer deliveries was examined, and the average delivery time was found to be 41.2 minutes. Historically, the standard deviation for delivery time is 10.6 minutes. Using a = 0.01, complete parts a and b below. a. Does this sample provide enough evidence to support the delivery time claim made by the pizza place? Determine the null and alternative hypotheses. Ho: 246 H₁: < 46 The z-test statistic is -2.86. (Round to two decimal places as needed.) 19

The z-test statistic is ( (Round to two decimal places as needed.) The critical z-score(s) is(are) (Round to two decimal places as needed. Use a comma to separate answers as needed.) Because the test statistic is less than the critical value, b. Determine the p-value for this test. The p-value is (Round to three decimal places as needed.) do not reject the null hypothesis.

Recently, the number of airline companies that offer in-flight Wi-Fi service to passengers has increased. However, it is estimated that only 16% of the passengers who have Wi-Fi available to them are willing to pay for it. Suppose the largest provider of airline Wi-Fi service, would like to test this hypothesis by randomly sampling 125 passengers and asking them if they would be willing to pay $4.95 for 90 minutes of onboard Internet access. Suppose that 31 passengers indicated they would use this service. Using α = 0.10, complete parts a and b below. a. What conclusions can be drawn about the proportion of airline passengers willing to pay for onboard Wi-Fi service? Determine the null and alternative hypotheses. Choose the correct answer below. O A. Ho: p≤0.16 H₁: p>0.16 C. Ho: p=0.16 H₁: p=0.16 O B. Ho: p > 0.16 H₁: p≤0.16 O D. Ho: p²0.16 H₁: p<0.16

Determine the critical value(s) of the test statistic. Za (Use a umma to separate answers as needed. Round to two decimal places as needed.) Calculate the test statistic. = Zp (Round to two decimal places as needed.) Determine the proper conclusion. Choose the correct answer below. OA. Do not reject Ho. There is insufficient evidence that the proportion of people with credit scores below 600 has increased B. Reject Ho. There is insufficient evidence that the proportion of people with credit scores below 600 has increased. c. Reject Ho. There is sufficient evidence that the proportion of people with credit scores below 600 has increased. OD. Do not reject Ho. There is sufficient evidence that the proportion of people with credit scores below 600 has increased. b. Determine the p-value for this test. p-value = 0 (Round to three decimal places as needed.). OC 目