True or False 1 Approximately 95 percent of the population X

True or False

1. Approximately 95 percent of the population X values will lie within the 95 percent confidence interval for the mean.

2. To estimate a proportion with a 4 percent margin of error and a 95 percent confidence level, the required sample size is over 800.

3. To estimate the required sample size for a proportion, one method is to take a small pilot sample to estimate ? and then apply the sample size formula.

4.To calculate the sample size needed for a survey to estimate a proportion, the population standard deviation ? must be known.

5. Sampling variation is not controllable by the statistician.

Solution

1 False 2 False 3 True 4 False 5) True