I have the documents uploaded for this case I'm having a hard time with this could someone please help me, the data set is in my uploads

1.Determine the range of values in which you would expect to find the average weekly sales for the entire sales force in your company 90% of the time.

a)Impact of increasing the confidence level to 95%

b)Impact of increasing the sample size to 150, 90% confidence level

2.Based on the calculated confidence interval for weekly sales on the sample of 50 reps at a 90% confidence level:

a)Calculate both Reps' average weekly performance and highlight if it is greater than the population mean.