1. What sample size is needed to give a margin of error within1.5%

in estimating a population proportion with99%

confidence? Assuming previous sample had s=3.3

Round your answer up to the nearest integer.

Sample size=

2. a 90% confidence interval for u using the sample results x = 135.4, s = 57.1 , and n =50.

Point Estimate:_________

Margin of error:________

The 90% confidence interval is:________