A manufacturer produces both a deluxe and a standard model of an automatic sander designed for home use. Selling prices obtained from a sample of retail outlets follow.
Retail Outlet Deluxe Standard
1 39 27
2 39 28
3 45 35
4 38 30
5 40 30
6 39 34
7 35 29
Round your answers to 2 decimal places.
The manufacturer's suggested retail prices for the two models show a $10 price differential. Use a .05 level of significance and test that the mean difference between the prices of the two models is $10.
b. What is the 95% confidence interval for the difference between the mean prices of the two models?