A rods manufacturer makes rods with a length that is supposed to be 15 inches. A quality control technician sampled 31 rods and found that the sample mean length was 15.09 inches and the sample standard deviation was 0.19 inches. The technician claims that the mean rod length is less than 15 inches. What type of hypothesis test should be performed?________ select (left-tailed z-test,left-tailed t-test,two-tailed t-test,right-tailed t-test) What is the test statistic?______ What is the number of degrees of freedom?______
A rods manufacturer makes rods with a length that is supposed to be 15 inches. A quality control technician sampled 31 rods and found that the sample mean length was 15.09 inches and the sample standard deviation was 0.19 inches. The technician claims that the mean rod length is less than 15 inches. What type of hypothesis test should be performed?________ select (left-tailed z-test,left-tailed t-test,two-tailed t-test,right-tailed t-test) What is the test statistic?______ What is the number of degrees of freedom?______
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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A rods manufacturer makes rods with a length that is supposed to be 15 inches. A quality control technician sampled 31 rods and found that the sample mean length was 15.09 inches and the sample standard deviation was 0.19 inches. The technician claims that the mean rod length is less than 15 inches.
What type of hypothesis test should be performed?________ select (left-tailed z-test,left-tailed t-test,two-tailed t-test,right-tailed t-test)
What is the test statistic?______
What is the number of degrees of freedom?______
Does sufficient evidence exist at the α=0.01 significance level to support the technician's claim?_____ select (yes or no)
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