Q1) What sample size would be required to evaluate true proportion of students at your college (if you are a student) who are wearing backpacks, with 95% confidence and error of ± 0.04?

Q2) Determine the 95% range for sample mean, assuming that each sample is from normal population

a) u=200, o=12, n=36                the 95% range...............to................

b) u=1,000, o=15, n=9              the 95% range.................to.................

c) u=50, o=1, n=25                    the 95% range..................to.................

Q3) Assume X = IQ (intelligence quotient) by definition is normally distributed with mean of 100 and standard deviation (s) of 10. If many samples of size 1000 persons are chosen, determine the expected value (mean X-bar) or average of average IQ's for these samples?

a) Sx/1000

b) 100

c) 10/sqrt(1000)

d) None of the above