Need answers and minitab instructions:

The American Heart Association recommends exercising with a target heart rate of 50 - 75percent of your maximum heart rate for moderately intense exercise.For people in their 40's this would be a range of approximately 90 - 150 beats per minute.A sample of 36 members of a beginners running club are in their forties.Each of these runners is monitored during one of the clubs runs; the mean heart rate is 124.6 beats per minute with a standard deviation of 19.7 beats per minute.Determine a 90% confidence interval for the mean heart rate of the club's members in their 40's.

Are people more willing to take a 5-6 minute survey over the phone than an 8-10 survey?An experiment is run to compare the response rates of callers conducting two different length surveys.Twenty-three student callers are randomly assigned to administer either a 5-6 minute survey or an 8-10 minute survey (each about the same topic).The response rates are listed below (rounded to the nearest whole percent).

5-6 Minute Survey:

1124183626817222833251826

8-10 Minute Survey:

14221927112914182416

a)Determine whether the variance should be pooled to test whether there is a difference in the mean response rate for the two surveys.(2)

b)Test at the 5% significance level whether the there is a difference in the mean (4)

response rates for the two different survey lengths.Include all six steps.