For a regression analysis to be valid, the error variable must have a standard deviation that is ____________________ regardless of the value of x.
Fill in the blank(s) with correct word
Q. 2A sample of size 200 is taken at random from an infinite population. Given that the population proportion is 0.60, the probability that the sample proportion is greater than 0.58 is:
a. 0.281
b. 0.719
c. 0.580
d. 0.762
Q. 3For a regression analysis to be valid, the error variable must have a mean of ____________________.
Fill in the blank(s) with correct word
Q. 4Given a binomial distribution with n trials and probability p of a success on any trial, a conventional rule of thumb is that the normal distribution will provide an adequate approximation of the binomial distribution if
a. np 5 and n(1 - p) 5
b. np 5 and np(1 - p) 5
c. np 5 and n(1 - p) 5
d. None of these choices.
Q. 5For a regression analysis to be valid, the error variable must have a(n) ____________________ distribution.
Fill in the blank(s) with correct word
Q. 6As 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.
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