1. The researchers surveyed more than 230 american male weight lifters, ranging in age from 18 to 40, and found that 12% o them had used HGH, which has been banned in sports for more than 20 years now. the median usage time for those who reported HGH use was 23 weeks. is each of the boldface numbers a parameter or a statistic?
A. The two boldface numbers are parameters
B. 12% is a parameter, 23 is statistic
C. 12% and 23 are statistics
D. 23 is a parameter, 12% is statistic
2. The central limit theorem says that when a simple sample of size n is drawn from any population with mean and standard deviation, then when n is sufficiently large
A. The distribution of the sample mean is exactly normal
B. The distribution of the sample mean is approximately normal
C. The distribution of the population is approximately normal
D. the standard deviation of the sample mean is o^2/n