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AP® Statistics

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Music Store

APSTAT-DVTRTA

A music store owner was curious about the number of customers his store gets per day.

He samples the next $25$ days and finds an average of $65.5$ customers with a standard deviation of $11.3$ customers.

Assuming these $25$ days represent a random sample of all days, a $95\%$ confidence interval for this data would be

A

$11.3+1.96 \times (\cfrac{65.5}{25})$

B

$65.5+1.96 \times (\cfrac{11.3}{25})$

C

$65.5+1.96 \times (\cfrac{11.3}{5})$

D

$65.5+2.064 \times (\cfrac{11.3}{5})$

E

$65.5+2.06 \times (\cfrac{11.3}{5})$