# Question: Refer to the data for problem 1 a Find the average

Refer to the data for problem 1.

a. Find the average difference and its standard error for every pair of advertisements (computed as ad 2 minus ad 1, ad 1 minus ad 3, and ad 2 minus ad 3).

b. Test every pair of advertisements at the 1% level and report the results.

a. Find the average difference and its standard error for every pair of advertisements (computed as ad 2 minus ad 1, ad 1 minus ad 3, and ad 2 minus ad 3).

b. Test every pair of advertisements at the 1% level and report the results.

## Relevant Questions

Three companies are trying to sell you their additives to reduce waste in a chemical manufacturing process. Youâ€™re not sure their products are appropriate because your process is different from the industry standard ...Answer the parts of exercise 1 using age in place of annual salary. a.* Draw box plots to compare these three groups. Comment on what you see. b.* Find the average for each training level, and comment. c.* Find the ...a. What happens if there is an outlier in one of the samples in a test of two unpaired samples? For each case (very large or very small outlier), say what the rank of the outlier would be. b. Which statistical method ...a. What assumption must be met for the sign test to be valid? b. What assumption is not required for the sign test but would be required for a t test to be valid? Consider the profits of the building materials firms in the Fortune 500, given in Table 16.4.1. a. Draw a histogram of these profit percentages. Describe the distribution. b. Find the average and the median. Explain why they ...Post your question