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As part of an annual review of its accounts, a discount brokerage selects a random sample...

As part of an annual review of its accounts, a discount brokerage selects a random sample of 27 customers. Their accounts are reviewed for total account valuation, which showed a mean of $39,500, with a sample standard deviation of $8,650. (Use t Distribution Table.)

What is a 95% confidence interval for the mean account valuation of the population of customers? (Round your answers to the nearest dollar amount.)
95% confidence interval for the mean account valuation is between $  and $ .
Math   Statistics-And-Probability   
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Answer #1

T-score for 95% confidence interval = t0.025,26 = 2.056

mean = 39500

s = 8650

Confidence interval

                               

                               

                                = (36077 , 42923)

95% confidence interval for the mean account valuation is between $36077 and $42923 .

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