The marketing director of a large department store wants to estimate the average
ID: 3260596 • Letter: T
Question
The marketing director of a large department store wants to estimate the average number of customers who enter the store every five minutes. She randomly selects five-minute intervals and counts the number of arrivals at the store. She obtains the figures 50, 32, 41, 48, 56, 80, 44, 29, 32, and 77. The analyst assumes the number of arrivals is normally distributed. Using these data, the analyst computes a 95% confidence interval to estimate the mean value for all five-minute intervals. What interval values does she get?
(Round the intermediate values to 2 decimal places. Round your answers to 2 decimal places.)
(ANSWER HERE) (ANSWER HERE)
Explanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
: Mean of variable
95% confidence interval results:
Hence,
95% confidence interval will be:
36.14 61.66
Variable Sample Mean Std. Err. DF L. Limit U. Limit var3 48.9 5.6400355 9 36.141353 61.658647Related Questions
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