venty-five Americans were surveyed to determine the number of hours they spend watching television ch month. The results showed that they watched an average of 13 hours each month with a standard viation of 5 hours. Assume that the underlying population distribution is normal. What is the expected value of the sampling mean? (Round to four decimal places).
venty-five Americans were surveyed to determine the number of hours they spend watching television ch month. The results showed that they watched an average of 13 hours each month with a standard viation of 5 hours. Assume that the underlying population distribution is normal. What is the expected value of the sampling mean? (Round to four decimal places).
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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Question

Transcribed Image Text:Seventy-five Americans were surveyed to determine the number of hours they spend watching television
each month. The results showed that they watched an average of 13 hours each month with a standard
deviation of 5 hours. Assume that the underlying population distribution is normal.
a) What is the expected value of the sampling mean?
(Round to four decimal places).
b) What is the standard deviation of the sampling mean or standard error?
(Round to four
decimal places).
c) What is the t critical value for a confidence Interval for 81?
(Round to four decimal
places).
Expert Solution

Step 1
Given :
Sample Size,
n = 75.0
Sample Mean,
x̄ = 13.0
standard deviation,
s = 5.0
Significance level,
α =1- 0.81
= 0.19
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