For sample sizes greater than 30, the sampling distribution of the mean is approximately normally distributed:
a. regardless of the shape of the population.
b. only if the shape of the population is symmetric.
c. only if the population is normally distributed.
d. None of these choices.
Question 2
In regression analysis, if the coefficient of determination is 1.0, then:
a. the sum of squares for error must be 1.0
b. the sum of squares for regression must be 1.0
c. the sum of squares for error must be 0.0
d. the sum of squares for regression must be 0.0
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A random sample of 87 airline pilots recruited by an airline service had an average yearly ...