A scatterplot
A) shows how Y and X are related when their relationship is scattered all over the place.
B) relates the covariance of X and Y to the correlation coefficient.
C) is a plot of n observations on Xi and Yi, where each observation is represented by the point (Xi, Yi).
D) shows n observations of Y over time.
Ans: C) is a plot of n observations on Xi and Yi, where each observation is represented by the point (Xi, Yi).
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In a frictionless world
A) Fully funded social security must necessarily make everyone better off, as it provides for retirement. B) Fully-funded social security is a constraint on private saving behavior, and therefore cannot make anyone better off. C) Fully funded social security is always preferred to pay-as-you-go social security. D) Fully funded social security is more efficient, because it is a private program instead of a government program.
If the prices of computer tablets rise, we would expect the number of tablet covers purchased to
A) increase. B) decrease. C) be equal to ten. D) be equal to one.