The following items pertain to determining sample size when a mean is involved.

Calculate the sample size for each case.

Problem-

Key Variable Standard Deviation Acceptable Error Confidence Level

1. Number of car rentals per year for business trip usage 10 2 95%
2. Number of songs download with iTunes per month 20 2 95%
3. Number of miles driven per year to commute to work 500 50 95%
4. Use of a 9 point scale measuring satisfaction with the brand 2 0.3 95%

Question :Evaluate the statement: Determining the appropriate statistical analysis to be

conducted is basically determined by the scales used and the research objectives.