anager of The Cheesecake Factory in Boston reports that on six randomly selected

Question

anager of The Cheesecake Factory in Boston reports that on six randomly selected weekdays, the number of customers served was 160, 165, 140, 265, 120, and 50. She believes that the number of confidence interval for the customers served on weekdays follows a normal distribution. Construct the 90% average number of customers served pn weekdays. Use Table 2 (Round intermediate calculations to 4 "sample mean" and "sample standard deviation to 2 decimal places. Round "r value to 3 decimal places and final answers to 2 decimal places.) Confidence interval to References eBook & Resources Worksheet

Explanation / Answer

Soludion: Given that number of customers 160,165,140,265,120,50
X = 150 , = 70.07 , n = 6
df = n-1 = 6-1 = 5
t = 2.015

=> 90% confidence interval for the average number of customers : X +/- t*/sqrt(n)
= 150 +/- 2.015*70.07/sqrt(6)
= 92.36 , 207.64

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