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.
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