Question

Question 6 (1 point) A new system promises to reduce the average delivery time of 22 hours. After the implementation of the new system, a sample of 100 deliveries showed a sample mean of 21.5 hours with a standard deviation of 2.5 hours. Assume a p-value = 0.08. What is your conclusion at alpha = 0.05? Question 6 options: I do not reject Ho. I conclude that the new system did not reduce the average delivery time I reject Ho. I conclude that the new system did not reduce the average delivery time I do not reject Ho. I conclude that the new system reduced the average delivery time I reject Ho. I conclude that the new system reduced the average delivery time

Question 7 (1 point) A new system promises to reduce the average delivery time of 22 hours. After the implementation of the new system, a sample of 100 deliveries showed a sample mean of 21.5 hours with a standard deviation of 2.5 hours. Assume a p-value = 0.18 and alpha unknown. What is your conclusion? Question 7 options: There is strong evidence that the new system reduced the average delivery time There is some evidence that the new system reduced the average delivery time There is extremely strong evidence that the new system reduced the average delivery time There is no evidence that the new system reduced the average delivery time

Question 8 (1 point) Which of the following could be an example of a matched samples problem? Question 8 options: Do basketball players get more injuries than soccer players? Do GA residents work more hours than FL residents? Do online shoppers spend more hours on Amazon this year compared to last year? Do men like beer more than women do?

Question 9 (1 point) What is the appropriate Excel add-in for a matched samples problem? Question 9 options: z test two sample for means t test two sample for means assuming equal variances t test paired two sample for means t test two sample for means assuming unequal variances

Question 10 (1 point) A sample of 100 GA residents showed a sample mean 20.5 hours with a standard deviation 2.5 hours. A sample of 100 FL residents showed a sample mean 20 hours with a standard deviation 1.5 hours. If the 95% confidence for the difference between the two population means is [-0.1,+0.9], what is your conclusion based on the interval? Question 10 options: GA residents do not work more hours than FL residents at 95% confidence since the point estimate is 0.5 GA residents work more hours than FL residents at 95% confidence since the point estimate is 0.5 GA residents work more hours than FL residents at 95% confidence since the interval starts negative and ends positive GA residents do not work more hours than FL residents at 95% confidence since the interval starts negative and ends positive

Answer 1

6. P-value is greater than 0.05 . So, fail to reject the null hypothesis.

Answer

do not reject Ho. I conclude that the new system did not reduce the average delivery time

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7. In this case p-value > 0.1

So, fail to reject the null hypothesis

Answer

There is no evidence that the new system reduced the average delivery time