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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 c. 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 as the standard deviation increases? As the mean increases?

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 c. 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 as the standard deviation increases? As the mean increases?

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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?
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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