The correlation between amount of caffeine consumed and nervous behavior was found to be .30. What conclusion can be drawn from this finding?
a. 30 of the of the variability in nervous behavior can be accounted for by variability in amount of caffeine consumed.
b. 9 of the of the variability in nervous behavior can be accounted for by variability in amount of caffeine consumed.
c. The correlation between nervous behavior and caffeine consumption is not significant
d. Consuming caffeine causes nervousness.
Question 2Which r-value represents the strongest correlation?
a. +.50
b. -.50
c. -.75
d. 1.65
Question 3A _______ refers to the degree of the relationship between two or more variables.
a. regression
b. correlation
c. relative frequency
d. matched sample
Question 4The covariance between height and running speed on the State College track team was equal to 28.21. This tells us that the
a. relationship between height and speed is significant.
b. relationship between height and speed is negative.
c. the correlation is equal to the square root of 28.21.
d. the correlation is equal to 28.21.
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