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5. To display the plot, press B 9. Pressing C will allow you to identify individual points in the plot. To make a confidence interval for a population proportion:
1. Press K and scroll to the TESTS menu. Scroll down until you ﬁnd the option 1–PropZInt and
2. Enter the number of successes (x) and sample size (n) for your sample.
(Be sure to enter the number, not proportion, of successes.)
3. Determine your conﬁdence level and select Calculate. Press [. The screen displays the
conﬁdence interval inside a set of parentheses and reports the sample proportion and sample size.
Note: Your instructor may want you to use a plus-4 interval, also known as the adjusted Wald conﬁdence interval, or a small sample interval.
To use these formulas, add 2 to the number of successes you observed and add 4 to the sample size, then follow the above procedures. 1.
2. ISBN-13: 978-0-321-57077-2
0-321-57077-4 90000 1 9 780321 570772 2 3 TI_card_570774_reprint.qxp 2/12/09 3:43 PM Page 1 TI-83/84® Descriptive Statistics: Summarizing Quantitative Variables (continued)
4. The Basics: Entering Data 5.
the arrows left and right, you can
choose different lists. The K button, located near the
middle of the calculator, contains
three important menus: EDIT, CALC,
and TESTS. You select a menu and a
command by moving the black highlighted boxes around with the arrow
keypad. When you have selected your
command, press [.
Here are some important list operations to input and manipulate
data in your calculator.
1. Select EDIT and 1:Edit to begin typing in your data. Use the
down arrow, or press [, to scroll down the list. By moving 2. 3. To ﬁnd the mean, look for the x symbol. To ﬁnd the standard
deviation, look for the symbol Sx. The sample size is denoted
Scroll down to ﬁnd the ﬁve-number summary (minX, Q1,
Med, Q3, and maxX) on the second screen. Using the Normal Distribution To clear a previously entered list,
move the cursor so it highlights
the list name and press P
and press [. This is important to do every time you begin to enter a new list.
To insert new lists, highlight any list name and select
F H to choose INS. You may use the alphabet keys to
enter any name. Plots for Displaying Quantitative Data: Boxplots, Histograms, and Scatterplots
You will make all your charts from the STAT PLOTS menu. To access it, select F E.
You can display up to three plots at one time for certain kinds of plots.
1. From the menu, select 1:Plot1 and
press F, then press one of the number keys from 1
press [. Move the blinking
through 6. Choose the list name with your data.
cursor to On and press [.
5. To view any plot, press B (on the top row of buttons)
2. You can make up to six different
and the 9 key, or press B and scroll down to option
kinds of displays for your data.
Four common ones are described.
6. Notice the picture has no scale. To view details of any plot,
press the C key. You can use the arrow keys to move
around the picture.
WARNING: From time to time when making plots, you will end
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- Spring '14
- Normal Distribution, arrow keys