A population has a known variance of 19.3. If you draw random
samples of size 33 and construct the sampling distribution of X, what
would be the value of σX?
Ans 4
A random sample of 17 brand A cigarettes has a mean nicotine
level of 27.4 mg and a standard deviation of 2.8 mg. Using a 95% C.I.,
estimate the mean nicotine level for all brand A cigarettes.
Ans 5