Data collected from 10 days of sales from a small bookstore had a mean of 10.4 salespeople working per day and a standard deviation of 5.64. Average sales (in $1000's) for the 10 days were 17.6 with a standard deviation of 5.34. The regression line for this data is: Sales = 8.10 + 0.9134 Number of Salespeople working. The assumptions and conditions for regression are met, and from technology we learn that SE(b1) = 0.0873 se = 1.477 Find a 95% prediction interval for Sales on a day with 12 employees working.