If the coefficient of correlation is -0.80, then the percentage of the variation in y that is explained by the variation in x is:
a. 80
b. 64
c. 89
d. None of these choices.
Q. 2For a sample size of 1, the sampling distribution of the mean is normally distributed:
a. regardless of the shape of the population.
b. only if the population values are larger than 30.
c. only if the population is normally distributed.
d. None of these choices.
Q. 3The coefficient of correlation is used to determine:
a. the strength and direction of the linear relationship between x and y.
b. the least squares estimates of the regression parameters.
c. the predicted value of y for a given value of x.
d. All of these choices.
Q. 4For 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.
Q. 5In 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
Q. 6Which of the following is true regarding the sampling distribution of the mean for a large sample size? Assume the population distribution is not normal.
a. It has the same shape, mean and standard deviation as the population.
b. It has the same mean as the population, but a different shape and standard deviation.
c. It the same mean and standard deviation as the population, but a different shape.
d. It has the same shape and mean as the population, but a different standard deviation.
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