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help with statistics homework

Statistics
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Bob Nale is the owner of Nale"s Quick Fill. Bob would like to estimate the mean number of gallons sold follows the normal distribution with a population standard deviation of 2.50 gallons, from his records he selects a random sample of 45 sales and finds the mean number of gallons sold at 8.30

a)What is the point estimate of the population mean?(Round your answer to 2 decimal places

point estimate

b)Determine a 95% confidence interval for the population mean(Round your answer to 2 decimal places) 

Apr 12th, 2015

a) 8.30

b)

the sandard deviation of sample mean is 2.5/sqrt(45) = 0.373

the zalpha for 95% confidence interval is 1.96

-1.96=<(x-8.3)/0.373<= 1.96 

 8.3-1.96*.373 =<x<=8.3+1.96*0.373

7.55=<x<=9.03

Apr 12th, 2015

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Apr 12th, 2015
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Apr 12th, 2015
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