Using 64 randomly selected phone calls, the average call length was calculated to be 4.2 minutes. It is known from previous studies that the variance of the length of phone calls is 1.44min 2. Assuming that the length of calls has a normal distribution (a) estimate an interval estimate of the length of a telephone conversation at the 0.95 confidence level (b) confidence 0.99 c) Compare the length of the two intervals and explain how the length of the interval depends on the confidence level.
Using 64 randomly selected phone calls, the average call length was calculated to be 4.2 minutes. It is known from previous studies that the variance of the length of phone calls is 1.44min 2. Assuming that the length of calls has a normal distribution (a) estimate an interval estimate of the length of a telephone conversation at the 0.95 confidence level (b) confidence 0.99 c) Compare the length of the two intervals and explain how the length of the interval depends on the confidence level.
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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Using 64 randomly selected phone calls, the average call length was calculated to be 4.2 minutes. It is known from previous studies that the variance of the length of phone calls is 1.44min 2. Assuming that the length of calls has a
(a)
(b) confidence 0.99
c) Compare the length of the two intervals and explain how the length of the interval depends on the confidence level.
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