Chapter 1

Question 1

Individual

Answer 1

the object described in a set of data

Question 2

Categorical variable

Answer 2

assigns labels that place each individual into a particular category

Question 3

Quantitative variable

Answer 3

counts or measurements

Question 4

Two-way table

Answer 4

Table of counts that summarizes data on the relationship between two categorical variables

Question 5

Marginal relative frequency

Answer 5

gives the percent or proportion for only one of the variables in a two way table

Question 6

Joint relative frequency

Answer 6

gives the percent or proportion for both the variables

Question 7

Conditional relative frequency

Answer 7

gives the percent or proportion for one variable among another variable

Question 8

Mosaic plot

Answer 8

segmented bar graph where width of bars is proportional to group size

Question 9

Segmented bar graph

Answer 9

categories stacked on top of each other

Question 10

Mean

Answer 10

Sum of all values (sigma Σ) divided by number of values
x̅ for samples (statistic)
μ for populations (parameter)

Question 11

Range

Answer 11

Distance between highest and lowest (single number)

Question 12

Standard deviation

Answer 12

Typical distance of values from mean

Question 13

Interquartile Range (IQR)

Answer 13

Q1 - Median of the values to the left of the median
Q3 - the median of the values to the right of the median
IQR - the distance between Q1 and Q3

Question 14

Outliers

Answer 14

Low < Q1 - 1.5 x IQR
High > Q3 + 1.5 x IQR