Chapter 4

Question 0

What’s the interquartile range?

Answer 0

The range of the middle 50% of the scores

Question 1

How do you solve for range?

Answer 1

Largest X minus smallest X

Question 2

For any set of data, the sum of the deviation scores will always be

Answer 2

0

Question 3

If a distribution has a M=50 and s=10, is a score of 65 average?

Answer 3

No. It’s above average.

Question 4

Variability is scores in a sample is usually _______ the variability of the scores in the population from which the sample was obtained.

Answer 4

Smaller

Question 5

As variance go up, error goes

Answer 5

Up

Question 6

A population of scores has a u = 50 and o=10. If every score is multiplied by 2, the new mean and standard deviation scores are..?

Answer 6

u= 100 and o=20

Question 7

The number of scores that are independent and free to vary is called..?

Answer 7

Degrees of freedom

Question 8

What’s the formula for SS?

Answer 8

SS= €X^2 - (€X)^2/N

Question 9

How do you calculate o^2 for a population? (variance)

Answer 9

O^2= SS/N

Question 10

How do you calculate o for a population? (standard deviation)

Answer 10

Square root of (SS/N)

Question 11

What is o?

Answer 11

Standard deviation

Question 12

What is o^2

Answer 12

Variance

Question 13

How do you calculate o^2 for a sample?

Answer 13

SS/df

Question 14

How do you calculate o for a sample?

Answer 14

Square root of (SS/DF)