The CEO of a large electric utility claims that 80 percent of his customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers, using simple random sampling. Among the sampled customers, 87 say they are very satisfied. Based on these findings, test the claim that the proportion of customers that are very satisfied with their service is greater than 80%. Using a = 0.05 level of significance. a. State the Null and Alternative Hypotheses. b. Calculate the Mean and Standard Error. Please show work. c. Use the calculator to find the P-value and Test Statistic. Please show work. d. What is your decision based on the p-value you found? Explain. e. State your conclusion in context to the problem.
The CEO of a large electric utility claims that 80 percent of his customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers, using simple random sampling. Among the sampled customers, 87 say they are very satisfied. Based on these findings, test the claim that the proportion of customers that are very satisfied with their service is greater than 80%. Using a = 0.05 level of significance. a. State the Null and Alternative Hypotheses. b. Calculate the Mean and Standard Error. Please show work. c. Use the calculator to find the P-value and Test Statistic. Please show work. d. What is your decision based on the p-value you found? Explain. e. State your conclusion in context to the problem.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. The CEO of a large electric utility claims that 80 percent of his customers are very satisfied with une
service they receive. To test this claim, the local newspaper surveyed 100 customers, using simple
random sampling. Among the sampled customers, 87 say they are very satisfied. Based on these
findings, test the claim that the proportion of customers that are very satisfied with their service is
greater than 80%. Using a = 0.05 level of significance.
a. State the Null and Alternative Hypotheses.
b. Calculate the Mean and Standard Error. Please show work.
c. Use the calculator to find the P-value and Test Statistic. Please show work.
d. What is your decision based on the p-value you found? Explain.
e. State your conclusion in context to the problem.
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