(a) Use the given data to find the minimum sample size required
to estimate the population proportion. Margin of error: 0.009;
confidence level: 99%; from a prior study, p is estimated by
0.146.
Minimum Sample Size: __________________________
(b) How many students must be randomly selected to estimate the
mean weekly earnings of students at one college? We want 95%
confidence that the sample mean is within $2 of the population
mean, and the population standard deviation is known to be $60.
Minimum Number of students: _____________________
(c) Assume that a sample is used to estimate a population
proportion p. Find the margin of error E that corresponds to the
given statistics and confidence level. Round the margin of error to
four decimal places. 90% confidence; the sample size is 1510, of
which 30% are successes
Margin of Error: _________________________________