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Question

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.

Model Price ($)	Model Price ($)
Retail Outlet	Deluxe	Standard	Retail Outlet	Deluxe	Standard
1	41	27	5	40	30
2	39	30	6	39	34
3	44	35	7	35	29
4	38	30

What is the 95% confidence interval for the difference between the mean prices of the two models (to 2 decimals)?