Question
you take a random sample of 500 police officers in the city of Lowell and find that their average annual salary is 53,000 with a
you take a random sample of 500 police officers in the city of Lowell and find that their average annual salary is 53,000 with a standard deviation.
A) construct 95% confidence interval?
B) Construct 99% confidence interval around your point estimate ?
C ) compare the results for a and b above: explain what happened to the size of your confidence interval ? why did it change ? how does it relate to precision?
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Precalculus Enhanced With Graphing Utilities (Subscription)
Authors: Michael Sullivan, Michael Sullivan III
7th Edition
0134273125, 9780134273129
