Please actually read the question and not copy and paste the answer from another person's question. It's 90% CI, under question c., not 95%. If you don't know the answer that's ok, neither do I, just move on, so someone else can do it.

I'm not sure if this site just rewards people for giving ANY answer rather than actually reading the question or what, but this is the 5th time I've had to post this question because someone didn't even read it and just copy-pasted another answer from a different post, if you're calculating 95% CI then I know you didn't even bother to read what I wrote at the top here or the actual question under (c).

A golf equipment manufacturer would like to convince members of a club that its golf balls travel farther than those of a rival. For comparison, twelve golfers were randomly selected from the club to each drive a ball from this manufacturer and from the rival. The results show the distance traveled, in yards. The complete set of results is provided below:

Golfer Distance (manuf) Distance (rival) 1 - 188 194 2 - 240 241 3 - 235 210 4 - 176 185 5 - 234 211 6 - 160 149 7 - 240 225 8 - 241 227 9 - 239 204 10- 251 255 11- 185 185 12- 166 151 a. Should every golfer hit the rival ball first and then the manufacturer's ball second? Explain your answer.

b. State the null and alternate hypotheses, paste the test output, and state your decision.

c. What is the 90% confidence interval for the mean difference? Interpret the confidence interval.

d. What assumption(s) was (were) required to perform this hypothesis test?

e. Does (do) the assumption(s) appear to be reasonably met in this case? Paste the Minitab output is required to answer this question here.

f. Comment on the source of sampling error and a potential source of non-sampling error for this study (be specific).

g. Rather than have each golfer hit one ball of each type, the manufacturer could have easily chosen 12 more golfers and allowed all 24 golfers to hit one ball. Should the manufacturer run the study as it did (12 golfers hitting each type of ball) or with 24 golfers hitting just one randomly assigned ball? Justify your answer