A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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ANSWERS SHOULD BE IN 3 DECIMAL PLACES

5. Construct a 90% confidence interval about the travel time (in hours) of students from their house to school using a random sample of 100 students. a. Sample mean of 1.98 and a standard deviation of 0.38 b. Sample mean of 1.98 and a standard deviation of 0.50 Sample mean of 1.25 and a standard deviation of 0.38 d. Find the widths of the intervals found in a, b and c. How do these widths change C. as the standard deviation increases? As the mean increases?
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Transcribed Image Text:5. Construct a 90% confidence interval about the travel time (in hours) of students from their house to school using a random sample of 100 students. a. Sample mean of 1.98 and a standard deviation of 0.38 b. Sample mean of 1.98 and a standard deviation of 0.50 Sample mean of 1.25 and a standard deviation of 0.38 d. Find the widths of the intervals found in a, b and c. How do these widths change C. as the standard deviation increases? As the mean increases?
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