PPT 2 - Frequency distributions

Question 1

Frequency distribution

Answer 1

-organizing/summarizing data
-find patterns, trends, outlines

Question 2

Frequency

Answer 2

number of times an event occurs

Question 3

Frequency distribution table

Answer 3

table in which the values of a variable are summarized by their frequency of occurrence

Question 4

Relative proportion

Answer 4

fraction that each value represents out of the total group

Question 5

Rp equation

Answer 5

frequency/total number of values (N)

Question 6

Continuous variables

Answer 6

gaps are created between intervals

Question 7

Midpoint

Answer 7

center of the interval
- add upper and lower limits then divide by two

Question 8

Interval width

Answer 8

distance between the midpoints

Question 9

Cumulative frequency

Answer 9

-# of times scores that are within that interval, or smaller intervals appear in the data
-last interval should be equal to sample size

Question 10

Relative percentage

Answer 10

percent of the data that fall within an interval

Question 11

Relative percentage equation

Answer 11

(frequency/sample size) x 100

Question 12

Cumulative percentage

Answer 12

% of total scores that fall within an interval and smaller intervals

Question 13

Cumulative percentage equation

Answer 13

(cumulative frequency/sample size) x 100

Question 14

Percentile

Answer 14

percent of scores that fall at or below as particular score

Question 15

Bar graph

Answer 15

-graph in which rectangles are used to represent frequencies of observations
-discrete variables (nominal and ordinal)

Question 16

Histogram

Answer 16

graph in which rectangles are used to represent frequencies of observations
-continuous variable (interval and ratio)

Question 17

Distribution

Answer 17

pattern of the scores in your data
-show symmetry, modality, kurtosis

Question 18

Symmetrical distribution

Answer 18

has the same shape on both sides of the center (identical)

Question 19

Skewness

Answer 19

measure of distribution’s asymmetry

Question 20

Tail

Answer 20

thin, stretched-out part at either end of the curve
- left = negative
- right = positive

Question 21

Kurtosis

Answer 21

peakedness of a curve
- flat = negative
- peak = positive

Question 22

Modality

Answer 22

describes the number of meaningful peaks of a distribution