Anna's project for her introductory statistics course was to compare the selling prices of textbooks at two Internet bookstores. She first took a random sample of ten textbooks used that term in courses at her college, based on t compiled by the college bookstore. The prices of those textbooks at the two Internet sites are shown below. Site A $115 $79 $41 $139 $99 $34 $75 $95 $120 $69 Site B $110 $79 $38 $129 $99 $34 $69 $95 $110 $66 Using software or a calculator, construct a 90% confidence interval comparing the population mean prices of all textbooks used that term at her college (price at Site A minus price at Site B). Interpret

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