Author Question: As a general rule, the normal distribution is used to approximate the sampling distribution of the ... (Read 89 times)

j.rubin · **on:** Jun 24, 2018

As a general rule, the normal distribution is used to approximate the sampling distribution of the sample proportion only if:
a. the sample size n is greater than 30.
b. the population proportion p is close to 0.50.
c. the underlying population is normal.
d. np and n(1 - p) are both greater than or equal to 5.

Question 2

If the coefficient of correlation is 0.90, then the percentage of the variation in the dependent variable y that is explained by the variation in the independent variable x is:
a. 90
b. 81
c. 95
d. None of these choices.