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 the list of texts compiled by the college bookstore. The prices of those textbooks at the two Internet sites are shown below. Complete parts a through c. Site A $115 $79 $42 $135 $98 $34 $78 $96 $118 $69 D Site B $110 $79 $39 $129 $98 $34 $69 $96 $108 $66 a. Are these independent samples or dependent samples? Justify your answer. Choose the correct answer below. A. The samples are dependent because the same books are used for each sample. OB. The samples are independent because different books are used for the two samples. OC. The samples are dependent because different books are used for the two samples. O D. The samples are independent because the same books are used for each sample. C b. Find the mean for each sample. Find the mean of the difference scores, where the difference is the price at Site A minus the price at Site B. Compare, and interpret. Find the mean for the sample from Site A. x₁ = $ 86.4 Find the mean for the sample from Site B. x₂ = $

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