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1

A scatter diagram is a chart
A)In which the dependent variable is scaled along the vertical axis.
B)In which the independent variable is scaled along the horizontal axis.
C)That portrays the relationship between two variables.
D)All of the above.
2

In correlation analysis
A)We consider several independent variables.
B)We study the strength of the association between two variables.
C)We consider the intercept with the Y-axis.
D)None of the above.
3

The coefficient of correlation
A)Has the same sign as the slope, i.e. b.
B)Can range from –1.00 up to 1.00
C)Is also called Pearson's r.
D)All of the above.
4

The coefficient of determination
A)Is the square of the coefficient of correlation.
B)Cannot be negative.
C)Reports the percent of the variation in the dependent variable explained by the independent variable.
D)All of the above.
5

Suppose we developed the following least squares regression equation: Y' = 3.5 + 2.1X. Which of the following statements are correct?
A)The dependent variable increases 2.1 for an increase of 1 in X.
B)The equation crosses the Y-axis at 3.5.
C)If X = 5, then Y' = 14.
D)All of the above.
6

The standard error of estimate
A)Is based on squared deviations from the regression line.
B)May assume negative values.
C)Is in squared units of the independent variable.
D)All of the above.
7

Which of the following is not a necessary condition for regression analysis?
A)The standard deviation of each of the conditional distributions must be the same.
B)The Y values are independent.
C)For each X value, there is a group of Y values and these Y values are normally distributed.
D)The slope of the regression line is positive (increasing).
8

Which of the following is not based on squared deviations from the regression line?
A)The coefficient of correlation.
B)The coefficient of determination.
C)The standard deviation.
D)The standard error of estimate.
9

In an ANOVA table for regression, the degrees of freedom for regression is
A)Equal to 1.
B)n – 1.
C)n – 2.
D)None of the above.
10

The term SSR/SST is also called the
A)Sum of squares due to regression.
B)Coefficient of determination.
C)Standard error of estimate.
D)Coefficient of correlation.
11

The correlation between two variables is –0.63 for a sample of 20 observations. What is the coefficient of determination between the two variables?
A).63
B).3969
C).7937
D)None of the above.
12

The correlation between two variables is –0.63 for a sample of 20 observations. We wish to show there is an inverse relationship between the two variables. Use the .05 significance level. Which of the following is a correct statement of the null hypothesis and the alternate hypothesis?
A)H0: r £ 0 H1: r > 0
B)H0: r £ 0 H1: r > 0
C)H0: r ³ 0 H1: r < 0
D)None of the above.
13

The correlation between two variables is –0.63 for a sample of 20 observations. What is the computed value of the test statistic?
A)3.442
B)–0.63
C)–3.442
D)None of the above.
14

The correlation between two variables is –0.63 for a sample of 20 observations. Which of the following is a correct conclusion based on the data given? Use the .05 significance level.
A)Reject H0. There is a negative association between the variables.
B)Do not reject H0. There is a negative association between the variables.
C)Reject H0. There is a positive association between the variables.
D)None of the above.
15

The correlation between two variables is 0.29 for a sample of 12 observations. What is the computed value of the test statistic?
A)1.001
B)1.292
C)3.166
D)1.097
16

The correlation between two variables is 0.29 for a sample of 12 observations. Based on a null hypothesis of no correlation versus an alternative hypothesis of positive correlation, what conclusion may be drawn at the .05 level of significance?
A)Reject H0. There is evidence of positive correlation between the variables.
B)Do not reject H0. We do not have evidence of positive correlation.
C)Reject H0. We have evidence of negative correlation.
D)None of the above.
17

The correlation between two variables is 0.29 for a sample of 12 observations. What is the coefficient of determination?
A).0841
B).29
C).024
D).303





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