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A random sample of 40 home theater system has a mean price of $142.00. Assume the...

A random sample of 40 home theater system has a mean price of $142.00. Assume the population standard deviation is $24.10. Use this information to a construct a 95% confidence interval for the population mean.

a. The critical corresponding to 95% level of confidence is ___________.
Math   Statistics-And-Probability   
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Answer #1

142   1.96 ( 24.10 / 40 )

142   7.469

( 134.53 , 149.47 )

A 95 % CI for population mean is (134.53 , 149.47 )

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a) The Critical corresponding to 95 % level of confidence is 1.96

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