A manager wants to determine whether or not the number of customers making purchases at her 2 stores are the same. Over 40 days she found store A had an average of 85 customers per day making...

A manager wants to determine whether or not the number of customers making purchases at her 2 stores are the same. Over 40 days she found store A had an average of 85 customers per day making purchases, with a standard deviation of 5 customers per day. Store B had an average of 90 customers per day, and a standard deviation of 8 customers per day. Solve using a two-tailed test of hypothesis and the p-value method. Use a 90% confidence level.