Explanation The confidence interval is as follows: C .I = x ¯ d ± t * s d n d Where x ¯ d , s d , and n d are the mean, standard deviation, and sample size for the sample differences, respectively. The difference between quiz and lecture pulse rate for students is denoted as d and is obtained as follows: Quiz Lecture d = Quiz − Lecture 75 73 2 52 53 –1 52 47 5 80 88 -8 56 55 1 90 70 20 76 61 15 71 75 –4 70 61 9 66 78 –12 The difference in means of quiz and lecture pulse rate for students is denoted as x ¯ d and is obtained as follows: x ¯ d = ∑ d n = ( 2 − 1 + 5 − 8 + 1 + 20 + 15 − 4 + 9 − 12 ) 10 = 27 10 = 2.7 The best estimate for the difference in means is x ¯ d = 2.7 . The difference in the standard deviations of quiz and lecture pulse rate for students is denoted as s d and is obtained as follows: s d = ∑ ( d − x ¯ d ) 2 n d − 1 = ( ( 2 − 2.7 ) 2 + ( − 1 − 2

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Author: Lock

Publisher: WILEY

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Chapter 6.5, Problem 250E

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Obtain and interpret a 95% confidence interval for the difference in mean pulse rate between students in a class lecture and taking a quiz.

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Chapter 6.5, Problem 249E

Chapter 6.5, Problem 251E

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