Using the appropriate formula (in other words, show all your work), find the requested information for your assigned problem. Make sure to explain your rationale as to why you used a z-interval or t-interval. Again, SHOW ALL YOUR WORK!! Don’t forget to interpret your solutions.  

Below is the question that must be answered in detail.

You randomly select 16 coffee shops in Atlanta and measure the temperature of the coffee sold at each. The mean temperature of these 16 shops was 1620 F with a standard deviation of 100 F.  

A)     Find a 99% confidence interval for the mean temperature of coffee sold at all coffee shops in Atlanta.

B)     If the sample size is doubled, repeat part A. What happened to the interval after the sample size was doubled?