Chapter 13: Inferential Statistics and Distributions
215
Chapter 13:
Inferential Statistics and Distributions
Getting Started: Mean Height of a Population
Getting Started is a fast-paced introduction. Read the chapter for details.
Suppose you want to estimate the mean height of a population of women given the random
sample below. Because heights among a biological population tend to be normally distributed, a
t
distribution confidence interval can be used when estimating the mean. The 10 height values
below are the first 10 of 90 values, randomly generated from a normally distributed population with
an assumed mean of 165.1 centimeters and a standard deviation of 6.35 centimeters
(
randNorm(165.1,6.35,90)
with a seed of 789).
Height (in centimeters) of Each of 10 Women
169.43 168.33 159.55 169.97 159.79 181.42 171.17 162.04 167.15 159.53
1. Press
… Í
to display the stat list editor.
Press
}
to move the cursor onto
L1
, and then
press
y 6
to insert a new list. The
Name=
prompt is displayed on the bottom line. The
Ø
cursor indicates that alpha-lock is on. The existing
list name columns shift to the right.
Note:
Your stat editor may not look like the one
pictured here, depending on the lists you have
already stored.
2. Enter
[H] [G] [H] [T]
at the
Name=
prompt, and then
press
Í
to create the list to store the women’s
height data.
Press
†
to move the cursor into the first row of the
list.
HGHT(1)=
is displayed on the bottom line.
Press
Í
.
3. Press
169
Ë
43
to enter the first height value. As
you enter it, it is displayed on the bottom line.
Press
Í
. The value is displayed in the first
row, and the rectangular cursor moves to the next
row.
Enter the other nine height values the same way.
