Chapter 2

Question 1

When to use median? (4)

Answer 1

1)Skewed distribution
2) Undetermined Values
3) Open Ended Distributions
4) Ordinal Data

Question 2

When to use mode?

Answer 2

1) Nominal data
2) Discrete Variables
3) Describing shape

Question 3

In a perfectly symmetrical unimodal distribution:

Answer 3

the mean=mode=median

Question 4

In a perfectly symmetrical bimodal distribution:

Answer 4

mean=median but mode will have a different value

Question 5

Positive skew

Answer 5

mode<median<mean

Question 6

Negative Skew

Answer 6

mode>median>mean

Question 7

Variability

Answer 7

Describes the degree to which the scores are spread out or clustered together

Question 8

Variance

Answer 8

Measure of variability by taking the average squared distance from the mean

Question 9

Why is n-1 used?

Answer 9

Because, regardless of the distribution, dividing by n-1 results in an unbiased estimator for the variance.

Question 10

Standard DEviation

Answer 10

Provides a measure of the average distance from the mean