The standard error of the estimate is a measure of the:
a. total variation in the y variable.
b. variation around the regression line.
c. percentage of variation in y explained by the variation in x.
d. the variation of the x variable.
Q. 2In general, the binomial probability P(X = x) is approximated by the area under a normal curve between x - .5 and x + .5.
Indicate whether the statement is true or false
Q. 3If the standard error of estimate is zero, then:
a. the coefficient of determination must be 1.0.
b. all the points fall on the regression line.
c. there is no unexplained variation left.
d. All of these choices are true.
Q. 4If a simple random sample of 300 observations is taken from a population whose proportion p = 0.6, then the expected value of the sample proportion p is 0.60.
Indicate whether the statement is true or false
Q. 5If the sum of squared residuals is zero, then the:
a. coefficient of determination must be 1.0.
b. coefficient of correlation must be 1.0.
c. linear relationship between x and y is perfect.
d. All of these choices are true.
Q. 6As a general rule, the normal distribution is used to approximate the sampling distribution of the sample proportion only if the sample size n is greater than or equal to 30.
Indicate whether the statement is true or false
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