is there evidence that the mean life is different from 7520 hours?   What is the test​ statistic?   ZSTAT=enter your response here ​(Round

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to
7520
hours. The population standard deviation is
980 hours.
A random sample of
49
light bulbs indicates a sample mean life of
7,310
hours.
a. At the
0.05
level of​ significance, is there evidence that the mean life is different from 7520 hours?
 
What is the test​ statistic?
 
ZSTAT=enter your response here
​(Round to two decimal places as​ needed.)
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