QUESTION 12 What shape will a distribution of prediction errors take? normal ske

Question

QUESTION 12

What shape will a distribution of prediction errors take?

normal

skewed

leptokurtic

bimodal

4 points   

QUESTION 13

In predicting the score on Y from a given score on X, we report that 68% of the time, the actual values on Y for people with the given X score will fall within what values?

+ or -1 standard deviation around the mean of Y

+ or -1 standard error of prediction around the mean of Y

+ or -1 standard deviation around the predicted score on Y

+ or -1 standard error of prediction around the predicted score on Y

4 points   

QUESTION 14

To minimize the size of the standard error of prediction, we should have:

1. a high correlation between X and Y
2. a small standard deviation for the distribution of Y scores

1 but not 2

2 but not 1

both 1 and 2

neither 1 nor 2

4 points   

QUESTION 15

A study has more than one independent variable. What analytic statistic will be appropriate?

ANOVA

Pearson's r

t test

normal

skewed

leptokurtic

bimodal

Explanation / Answer

(12) normal. (since the residuals or prediction errors have to be normally distributed during regression analysis)
(13) + or -1 standard deviation around the mean of Y.
(14) both 1 and 2. (since both high correlation between X and Y and lower S.D. of Y is required for this to happen)
(15) ANOVA. (since we can perform a two way ANOVA if we have 2 independent variables)

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