Chapter 7

Question 1

Statistic

Answer 1

Number that describes a characteristic of a sample

Question 2

Parameter

Answer 2

Number that describes a characteristic of the population

Question 3

∑x

Answer 3

Sum of all x scores

Question 4

Central tendency

Answer 4

Summarizes the location of a distribution

Question 5

Mode

Answer 5

Most frequent score; nominal and bimodal

Question 6

Median

Answer 6

50th percentile; ordinal and highly skewed

Question 7

Mean

Answer 7

Average. Line x, = (∑x)/N; ratio and interval

Question 8

Deviation

Answer 8

Distance separating a score from the mean; Raw score minus the mean; amount of error in prediction

Question 9

Sum of deviations equals

Answer 9

0

Question 10

Uses of sample mean

Answer 10

Predict scores, describe a relative position of an individual, draw inferences about the pop

Question 11

µ

Answer 11

Mean of pop

Question 12

What variable does central tendency depend on?

Answer 12

Dependent

Question 13

Line graph

Answer 13

When IV is an interval/ration variable, connect data points with straight lines

Question 14

Bar graph

Answer 14

When IV is nominal and ordinal data