Author Question: About 95.4 of the values of a normal random variable are within approximately how many standard ... (Read 144 times)

809779 · **on:** Jun 24, 2018

About 95.4 of the values of a normal random variable are within approximately how many standard deviations of its mean?
a. 1.7
b. 2
c. 2.5
d. 3

Question 2

We can use the normal distribution to make confidence interval estimates for the population proportion, p, when _____.
a. np 5
b. n(1 p) 5
c. p has a normal distribution
d. np 5 and n(1 p) 5