1. This data is from a sample. Calculate the mean, standard deviation, and variance.

46.9 21.3 34.5 15.1 12.6 36.9 17.3

Please show the following answers to 2 decimal places.

Sample Mean = ( )

Sample Standard Deviation = ( )

Sample Variance = ( )

Ooops - now you discover that the data was actually from a population! So now you must give the population standard deviation.

Population Standard Deviation = ( )

2. You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 80% confident that you estimate is within 5% of the true population proportion. How large of a sample size is required? n= ( )