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BESC 3010 - CHAPTER 11 - FINAL EXAM QUESTIONS AND ANSWERS
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BESC 3010 - CHAPTER 11 - FINAL EXAM QUESTIONS AND ANSWERS
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BESC 3010 - CHAPTER 11 - FINAL EXAMQUESTIONS AND ANSWERS
If the dots on a scatterplot generally extend from the bottom left to the upper right of the
diagram but are very widely spread out, the researcher would report the correlation as:
A. Strong and negative
B. Weak and positive
C. Close to zero
D. Strong and positive - Answer -weak and positive
What is the minimum level of measurement to calculate a Pearson's r correlation
coefficient?
A. Ratio
B. Ordinal
C. Interval
D. Nominal - Answer -interval
What is the non-directional null hypothesis for correlation?
A. r = 0 (or rho = 0)
B. r = 1 (or rho = 1)
C. r < 1 (or rho < 1)
D. r > 0 (or rho > 0) - Answer -r = 0
What is the predicted value of Y when X = 10 using this regression equation?
Y = 30 - 1.2*X
A. 18
B. Cannot be calculated without additional information
C. 28.8
D. 10 - Answer -18
Correlations (using the Pearson product moment correlation coefficient) may be
uninterpretable and inappropriate if the data...
A. are interval level.
, B. are inversely related.
C. have a nonlinear relationship.
D. come from a sample with n < 20. - Answer -have a nonlinear relationship
The difference between a predicted Y score and an actual observed Y score is known
as the...
A. All of the answers are correct
B. imperfection coefficient.
C. error ratio.
D. residual. - Answer -residual
If the dots on a scatterplot are spread out randomly, the researcher would report the
correlation as:
A. Weak and negative
B. Strong and positive
C. Close to zero
D. Weak and positive - Answer -close to zero
Which of the following is an impossible value forR^2 R 2 ?
A. 1.10
B. .36
C. .00
D. .16 - Answer -1.10
If the mean of X is 42, the mean of Y = 72, andr_{XY} r X Y = 0, then what is the
predicted value of Y when X = 30?
A. 42
B. Cannot be predicted without additional information
C. 0
D. 72 - Answer -72
Which of the following is true about regression towards the mean?
A. Predicted Y values will have less variation than actual observed values of Y
B. Predicted Y values will not always be perfect unless r = ± 1
C. All of the answers are correct
D. Predicted Y values tend to be closer to the mean of Y than the observed values of X
are to the mean of X - Answer -all of the answers are correct
When people who score low on one variable tend to score low on another variable, then
those two variables...
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