Exercise 8-23 Algo The manager of The Cheesecake Factory in Boston reports that

Question

Exercise 8-23 Algo The manager of The Cheesecake Factory in Boston reports that on six randomly selected weekdays, the number of customers served was 240, 185, 165, 180, 130, and 120. She believes that the number of customers served on weekdays follows a normal distribution. Construct the 99% confidence interval for the average number of customers served on weekdays. Use Table 2. (Round intermediate calculations to 4 decimal places, "sample mean" and "sample standard deviation" to 2 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval to

Explanation / Answer

Ans:

Sample mean=170

sample standard deviation,s=43.2435

n=6

df=6-1=5

critical t value=tinv(0.01,5)=4.032

99% confidence interval for mean

=170+/-4.032*(43.2435/sqrt(6))

=170+/-71.18

=(98.82, 241.18)

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