Chapter 4 Flashcards Preview

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Flashcards in Chapter 4 Deck (15):
0

How do you solve for range?

Largest X minus smallest X

1

What's the interquartile range?

The range of the middle 50% of the scores

2

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

0

3

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

No. It's above average.

4

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

Smaller

5

As variance go up, error goes

Up

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..?

u= 100 and o=20

7

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

Degrees of freedom

8

What's the formula for SS?

SS= €X^2 - (€X)^2/N

9

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

O^2= SS/N

10

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

Square root of (SS/N)

11

What is o?

Standard deviation

12

What is o^2

Variance

13

How do you calculate o^2 for a sample?

SS/df

14

How do you calculate o for a sample?

Square root of (SS/DF)