Distributions

Question 1

Skewed

Answer 1

Amount of skew determines distributions shape. A normal distribution has a skew value of 0. An assymetrical a value below/above 0.

Question 2

Covariance

Answer 2

Variability among scores in two different distributions

Question 3

Interpreting association between variables

Answer 3

Direction and magnitude. Covar provides clear info about the direction of association, not the magnitude. Correlation on both

Question 4

Correlation

Answer 4

Shows linear asssociation between two variables. Is a number betw. -1 & +1, and it gives clear indication of the magnitude and direction of the association.

Question 5

Binary items

Answer 5

2 possible answers; eg yes/no, 0/1, false/true etc. Variance of a binary item ix max if half respond positive and half neg. (var = .5)