13-2 Inferential Statistics and Distributions
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 2 of 36
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 cm. and a standard deviation of 6.35 cm.
(randNorm(165.1,6.35,90) with a seed of 789).
Height (in cm.) 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 [INS]. 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. The list to which
you will store the women’s height data is
created.
Press † to move the cursor onto the first
row of the list. HGHT(1)= is displayed on the
bottom line.
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.
Getting Started: Mean Height of a Population