17B

Variable Description
ID Identification number
Height Height in centimeters (cm)
Weight Weight in kilograms (kg)
Age Age in years
Sex Male/female
Smokes Are you a regular smoker? (yes/no)
Alcohol Are you a regular drinker? (yes/no)
Exercise What is your frequency of exercise? (low, moderate, high)
GroupAssignment Whether the student ran or sat between the first and second pulse measurements
Pulse1 First pulse measurement (rate per minute)
Pulse2 Second pulse measurement (rate per minute)
Year Year of class (1993–1998)
Variable name Definition
id Identification number of the student
female Gender of the student (0 = male, 1 = female)
race Ethnic background of the student (1 = Hispanic, 2 = Asian, 3 = Black, 4 = White)
ses Socio-economic status of the student (1 = low, 2 = medium, 3 = high)
schtyp School type (1 = public, 2 = private)
prog Program type (1 = general, 2 = academic preparatory, 3 = vocational/technical)
read Score from test of reading
write Score from test of writing
math Score from test of math
science Score from test of science
socst Score from test of social studies
id schtyp Indicator variable (public)
30 1
31 2
32 1
33 1
34 2
Coefficients Estimate
Intercept 18.12
math 0.66
female – indicator variable (1 = female)* 2.16
Level ses-medium

(1 = medium)

 ses-high

(1 = high)
ses = low 0
ses = medium 1
ses = high 0
Coefficients Estimate
Intercept 16.59
math 0.63
ses-medium (1 = medium) 2.08
ses-high (1= high) 3.32
Variable Description
ID Identification number
Height Height in centimeters (cm)
Weight Weight in kilograms (kg)
Age Age in years
Sex Male/female
Smokes Are you a regular smoker? (yes/no)
Alcohol Are you a regular drinker? (yes/no)
Exercise What is your frequency of exercise? (low, moderate, high)
GroupAssignment Whether the student ran or sat between the first and second pulse measurements
Pulse1 First pulse measurement (rate per minute)
Pulse2 Second pulse measurement (rate per minute)
Year Year of class (1993–1998)
ID Alcohol

(Are you a regular drinker?)

 Indicator variable
2 Yes
3 Yes
6 Yes
10 Yes
11 Yes
18 Yes
22 No
26 No
29 Yes
30 Yes
Coefficients Estimate
Intercept 86.776
Weight 0.176
Alcohol indicator variable (1 = yes) 1.011
Parameter Estimate
Intercept 7.54680337
Pulse1 0.88733028
GroupAssignment = ran 52.34616648
Variable Description
ID Identification number
Height Height in centimeters (cm)
Weight Weight in kilograms (kg)
Age Age in years
Sex Male/female
Smokes Are you a regular smoker? (yes/no)
Alcohol Are you a regular drinker? (yes/no)
Exercise What is your frequency of exercise? (low, moderate, high)
GroupAssignment Whether the student ran or sat between the first and second pulse measurements
Pulse1 First pulse measurement (rate per minute)
Pulse2 Second pulse measurement (rate per minute)
Year Year of class (1993–1998)
Skill or Concept: I can . . . Questions to check your understanding Rating
from 1 to 5
Calculate counts for a categorical variable using technology. 1–4
Interpret graphical displays for categorical variables. 5 and 6

A person in a wheelchair and wearing a disposable mask sitting at an outdoor table working on a laptop. A scatterplot labeled “math” on the horizontal axis and “science” on the y-axis. There is a legend titled gender showing that the blue line and points indicate female and the red line and points indicate male. The red dots are arranged in a loosely linear pattern. The red line has a positive slope. The blue dots are also arranged in a loosely linear pattern and the blue line appears to have a similar slope to the red line, but is slightly beneath it. A scatterplot labeled “math” on the horizontal axis and “science” on the y-axis. There is a legend titled ses showing that the blue line and points indicate 2, the red line and points indicate 3, and the green line and points indicate 1. The red dots are arranged in a loosely linear pattern. The red line has a positive slope. The blue dots are also arranged in a loosely linear pattern and the blue line appears to have a similar slope to the red line, but is slightly beneath it. The green dots are also arranged somewhat linearly and the green line also has the same slope and is even further below the other lines. A scatterplot labeled “Weight” on the horizontal axis and “Pulse1” on the y-axis. There is a legend titled alcohol showing that the blue line and points indicate yes and the red line and points indicate no. The red dots are arranged in a loosely linear pattern. The red line has a negative slope. The blue dots are also arranged in a loosely linear pattern and the blue line appears to have a similar slope to the red line, but is slightly beneath it. A scatterplot titled “Analysis of Covariance for Pulse2.” It is labeled “Pulse1” on the horizontal axis and “Pulse2” on the y-axis. There is a legend titled Group Assignment showing that the blue line and points indicate ran and the red line and points indicate sat. The red dots are arranged in a clustered linear pattern and the red line has a positive slope. The blue dots are arranged in a loosely linear patter and the blue line appears to have a similar slope to the red line, but is higher than it. A box plot of first pule by male/female. The x-axis is labeled “Male/Female” and the y-axis is labeled “First Pulse.” For female, the low point is at approximately 60 and the high point is at approximately 105. The low end of the box is at approximately 68, the high end is at approximately 84, and the middle line is at approximately 76. For male, the low point is at approximately 49 and the high point is at approximately 93. The low end of the box is at approximately 66, the high end is at approximately 80, and the middle line is at approximately 75. A box plot of first pule by exercise. The x-axis is labeled “Exercise Frequency” and the y-axis is labeled “First Pulse.” For los, the low point is at approximately 52 and the high point is at approximately 92. The low end of the box is at approximately 70, the high end is at approximately 84, and the middle line is at approximately 78. For moderate, the low point is at approximately 58 and the high point is at approximately 90. The low end of the box is at approximately 68, the high end is at approximately 79, and the middle line is at approximately 76. For high, the low point is at approximately 49 and the high point is at approximately 96. The low end of the box is at approximately 61, the high end is at approximately 76, and the middle line is at approximately 67.

Glossary

indicator variable
a binary variable with only two values: 0 and 1.