Chalter 3+4

Question 1

Central tendency

Answer 1

The most typical, central, or common score of a variable

Question 2

3 measures of central tendency

Answer 2

Mean
Median
Mode

Question 3

Mode

Answer 3

Most common score

Question 4

Median

Answer 4

Score of the middle case

Question 5

Mean

Answer 5

Average score

Question 6

Dispersion

Answer 6

Variety, diversity, or amount of variation between scores

Question 7

Measures of dispersion

Answer 7

Index of qualitative variation
Range, interquartile range
Variance, standard deviation

Question 8

Mind the median

10,10,8,7,5,4,2

Answer 8

7

Question 9

Find the range
10,10,8,7,5,4,2

Answer 9

10-2=8

Question 10

x̄

Answer 10

Mean

Question 11

Calculate x̄

10,20,30,40,50

Answer 11

150 ➗5= 30

Question 12

What scores does the mean use

Answer 12

All scores

Question 13

What is a skewed distribution

Answer 13

Pulling the mean

Question 14

Positive skewed distribution

Answer 14

Pulls the mean to the right

Mean> median

Question 15

Negative skewed distribution

Answer 15

Pulls the mean to the left

Mean< median

Question 16

Unskewed distribution

Answer 16

In the middle

Mean= median

Doesn’t happen in fact

Question 17

Standard deviation

Answer 17

Average distance of each score to the mean

Question 18

Variance

Answer 18

Square of standard deviation

Question 19

3 characteristics of standard deviation

Answer 19

Use all score in a distribution
Lowest possible value is 0
Increase in value as distribution

Question 20

How to find standard deviation (5)

Answer 20

1. Subtract mean from each score
2. Square each deviation
3. Add squared deviations
4. Divide the sum of squared deviations by the # of scores
5. Find the square root of the result

Question 21

Characteristics of the normal curve

Answer 21

-bell shape
-symmetrical/ unimodal
-theoretical

Question 22

Units for z scores

Answer 22

Units of standard deviation

Question 23

What level of measurement is used for z-scores

Answer 23

Interval ratio

Question 24

2 characteristics of under the normal curve

Answer 24

Above or below a given score
Between two given scores

Question 25

Where to look to find the area above and below z positive or negative

Answer 25

Question 26

Example of a discrete variable

Answer 26

Rolling a die

Question 27

Example of a continuous variable

Answer 27

Body weight

Question 28

What is a normal curve

Answer 28

A bell shaped theoretical distribution of scores

Question 29

What is probability

Answer 29

Ratio of number of success to number of possible events

Question 30

Percentage between -1 & +1 SD

Answer 30

68.26

Question 31

Percentage between -2 & +2 SD

Answer 31

95.44%

Question 32

Percentage between -3 & +3 SD

Answer 32

99.72%

Question 33

What is a Z-score

Answer 33

The way scores are expressed after they have been standardized to the theoretical normal curve

Question 34

Index of qualitative variation

Answer 34

Amount of variation observed in a distribution of normal or ordinal-level variables scores to the maximum variation that could exist

Question 35

outliers

Answer 35

Extreme high or low scores in a distribution

Question 36

interquartile range

Answer 36

distance from the 3rd quartile to the 1st quartile

Question 37

5 number summary

Answer 37

lowest score highest score median 1st quartile 3rd quartile

Question 38

deviations

Answer 38

distance between the scores and mean

Question 39

mean deviation

Answer 39

average of absolute deviations of the scores around the mean

Question 40

coefficient of variation

Answer 40

ratio of SD to the mean