Exhibit 16

question 21

Multiple Choice

Exhibit 16.3 Stella would like to determine the amount of the average purchase at her software store with a total precision of $10,a historical average purchase variance of $150,and at a 95% confidence level.
Refer to Exhibit 16.3.If Stella wishes to increase the total precision to $5,what sample size is needed?

• A)8
• B)54
• C)48
• D)96
• E)24