Chapter 3
1.
Three tools to describe, picture, and quantify the relationship between two quantitative (data that can be
recorded as numerical values and then meaningfully ordered to those values) variables
a.
Scatterplot A two dimensional graph of data va
Exercise #3 Pg. 123
Dhvani Thakar
Normal Probability Plot:
Probability Plot of C1
Normal - 95% CI
99
Mean
S
tDev
N
AD
P-Value
95
90
Percent
80
70
60
50
40
30
20
10
5
1
45
50
55
60
65
70
75
C1
a.
Variable
C1
N
20
Mean
59.550
StDev
4.261
SE Mean
0.953
99% C
Number of students
Ethnicity of the student body
1000
800
600
400
200
0
Ethnicity-AG
Dhvani Thakar
Section H72
Ethnicity of the student body
0.3% 6.1%
4.7%
5.9%
1.1%
12.0%
70.0%
Dhvani Thakar
Section H72
Category
American Indian or Alaska Native
Asian
Bla
1. Complete the table above and use the table to calculate the mean and standard deviation
for the random variable, X? First thing is to figure out the last value for probability, add up
each column and subtract it from 1. Then multiply each pairing and a