The manufacture of chemical heating pads claims that the mean heat output of the pad is 50 watts. A sample of 12 pads gives a sample mean of 53.4 watts. Assume that the standard deviation is known from previous tests to be 6.3 watts. a) Does the evidence suggest that the mean heat output is actually greater than 50 watts? Formally test using a significance level of 5%. b) What is the pvalue for this test?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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The manufacture of chemical heating pads claims that the mean heat output of the pad is 50
watts. A sample of 12 pads gives a sample mean of 53.4 watts. Assume that the standard
deviation is known from previous tests to be 6.3 watts.
a) Does the evidence suggest that the mean heat output is actually greater than 50 watts?
Formally test using a significance level of 5%.
b) What is the pvalue
for this test?

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