I need help with the questions listed below. I am struggling with what to do. A step by step process would be nice

1)The following airborne times doe United Airlines flight 488 from Albuquerque to Denver on 10 randomly selected days are give below : 57, 54, 55, 51, 56, 48, 52, 51, 59, 59.

A) Compute and interpret a 90% confidence interval for the mean airborne time for flight 448.

B) Based on your interval in part A, if flight 448 is scheduled to depart at 10:00 AM, what would you recommend for the published arrival time? EXPLAIN.

2) A triathlon consisting of swimming, cycling, and running is one of the more strenuous amateur sporting events. A research study reposts the maximum heart rate ( in beats per minute) for 9 randomly selected triathletes results were:

_ s

x

Swimming 188 7.2

Biking 186 8.5

Running 194 7.8

A) Assuming that the heart rate distribution for each event is approximately normal, construct a 95% confidence intervals for the true mean heart rates of the triathletes for each event.

B) Based off the computed confidence intervals, do you thin there is evidence that the mean maximum heart rate is higher for running than for the other two events?

3) An article in the Journal of Irreproducible Results predicted dire consequences resulting from a nationwide buildup of National Geographic magazines, since the subscriptions are increasing and no one ever throws an issue away. A key to the analysis is the weight of an issue of the magazine. Suppose you were assigned the task of estimating the average weight of an issue of National Geographic. How many issues should you sample to estimate the average weight within 0.1 ounces with 95% confidence? Assume that o- is known to be 1 ounce.

Anything helps! Thank you!