. Both are highly qualified so you have decided to evaluate their sales performance for the past year.

Use the Week 4 Data Set to create and calculate the following in Excel®:

  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.
    • Calculate the impact of increasing the confidence level to 95%?
    • Calculate the impact of increasing the sample size to 150, assuming the same mean and standard deviation, but allowing the confidence level to remain at 90%?
  2. Based on the calculated confidence interval for weekly sales on the sample of 50 reps at a 90% confidence level:
    • Calculate both Reps’ average weekly performance and highlight if it is greater than the population mean.
  3. You want to determine whether there is a statistically different average weekly sales between Sales Rep A and Sales Rep B.
    • Create Null and Alternative Hypothesis statements that would allow you to determine whether their sales performance is statistically different or not.
    • Use a significance level of .05 to conduct a t-test of independent samples to compare the average weekly sales of the two candidates.
    • Calculate the p-value?
  4. Considering that individual you did not promote:
    • Determine whether this person’s average weekly sales are greater than the average weekly sales for the 50 sales reps whose data you used to develop confidence intervals.
    • Create Null and Alternative Hypothesis statements that would allow you to determine whether the new Sales Manager’s weekly average sales are greater than the sample of Sales Reps.
    • Use a significance level of .05 to conduct a t-test of independent samples to compare the average weekly sales of both.
    • Calculate the p-value?

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