Question

Question 14 (1 point) In a consumer research study, several Meijer and Walmart stores were surveyed at random and the average basket price was recorded for each. You wish to determine if the average basket price for Meijer is less than the average basket price for Walmart. It was found that the average basket price for 24 randomly chosen Meijer stores (group 1) was $51.574 with a standard deviation of $11.9675. Similarly, a random sample of 15 Walmart stores (group 2) had an average basket price of $53.18 with a standard deviation of $11.2489. Perform a two independent samples t-test on the hypotheses Null Hypothesis: H1 2 42. Alternative Hypothesis: u1< H2. What is the test statistic and p-value of this test? You can assume that the standard deviations of the two populations are statistically similar. 1) Test Statistic: 0.417, P-Value: 0.6605 2) Test Statistic: 0.417, P-Value: 0.3395 3) Test Statistic: -0.417, P-Value: 0.3395 4) Test Statistic: -0.417, P-Value: 0.6605 Test Statistic: -0.417, P-Value: 0.679

Answer 1

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Question 14 (1 point) We can use the TI 84 to find the answer to this In a consumer research study, several Meijer and Walmart stores were surveyed at random and the average basket price was recorded for each. You wish to determine if the average basket price for Meijer is less than the average basket price for Walmart. It was found that the average basket price for 24 randomly chosen Meijer stores (group 1) was $51.574 with a standard deviation of $11.9675. Similarly, a random sample of 15 Walmart stores (group 2) had an average basket price of $53.18 with a standard deviation of $11.2489. Perform a two independent samples t-test on the hypotheses Null Hypothesis: H1 22. Alternative Hypothesis: H1 < H2 quesiton. The steps are as follows: Press STAT and then scroll right to TESTS Then scroll down to 2-SampTTest... Scroll to stats and fill the details as: 2-SamPITest Inpt: Dat a Stats S1:51.574 Sx111.9675 n1:24 X2:53. 18 Sx2: 11.2489 n2: 15 What is the test statistic and p-value of this test? You can assume that the standard Pooled:NoYes Calculate Draw deviations of the two populations are statistically similar. 2-SaMPTTest 1) Test Statistic: 0.417, P-Value: 0.6605 t=-.4170127697 3395393672 151.574 2-53. 13 2) Test Statistic: 0.417, P-Value: 0.3395 3) Test Statistic: -0.417, P-Value: 0.3395 4) Test Statistic:-0.417, P-Value: 0.6605 5) Test Statistic: -0.417, P-Value: 0.679

Question 15 (1 point) Does the amount of hazardous material absorbed by the bodies of hazardous waste workers depend on gender? The level of lead in the blood was determined for a sample of men and a sample of women who dispose of hazardous waste as a full time job. You want to test the hypotheses that the amount absorbed by men is different from the amount absorbed by women. After performing a hypothesis test for two independent samples, you see a p-value of 0.0241. Of the following. which is the appropriate conclusion? average amount of lead absorbed by men is equal to the average amount The 1) of lead absorbed by women. average amount of lead absorbed by men is significantly less than the The 2) average amount of lead absorbed by women. The average amount of lead absorbed by men is significantly different from 3) the average amount of lead absorbed by women. average amount of lead absorbed by men is significantly greater than the The 4) average amount of lead absorbed by women. We did not find enough evidence to say a significant difference exists 5) between the average amount of lead absorbed by men and the average amount of lead absorbed by women.

Question 16 (1 point) A new gasoline additive is supposed to make gas burn more cleanly and increase gas mileage in the process. Consumer Protection Anonymous conducted a mileage test to confirm this. They took a sample of their cars, filled it with regular gas, and drove it on I-94 until it was empty. They repeated the process using the same cars, but using the gas additive. Using the data they found, they performed a paired t-test with data calculated as (with additive - without additive) with the following hypotheses: Null Hypothesis: HD = 0, Alternative Hypothesis: HD 0. If they calculate a p-value of 0.0071 in the hired samples t-test. what is the appropriate conclusion? 1) The average difference in gas mileage is equal to O. We did not find enough evidence to say the average difference in gas mileage 2) was not 0. The additive does not appear to have been effective. average difference in gas mileage is significantly different from 0. There The 3) is a significant difference in gas mileage with and without the additive. The average difference in gas mileage is significantly less than 0. The average 4) gas mileage was higher without the additive. The average difference in gas mileage is significantly larger than 0. The 5) average gas mileage was higher with the additive.