MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Test the following claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that addresses the original claim.
A simple random sample of credit rating scores is obtained, and the scores are listed below. The mean credit score was reported to be
normally distributed and the standard deviation of all credit scores is known to be
675.
Assuming the population is 57.7,
use a 0.05 significance level to test the claim that these sample credit scores come from a population with a mean equal to
675.
715
750
663
788
817
779
699
837
750
834
693
800
a) What are the null and alternative hypotheses?
b) What is the P-value?
c) Does this reject or fail to reject H0?
d) Is there sufficient evidence to warrant rejection of the claim that these sample credit scores are from a population with a mean credit score equal to 675?
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