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Note pay close attention when the calculator screen

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Unformatted text preview: [. 3. To see all the results, scroll down to the bottom of the screen. Note: Pay close attention when the calculator screen displays an arrow pointing up or down—this means there is more information available that you can find by scrolling. Inferences for Proportions These instructions assume that you have entered your explanatory (otherwise called predictor or independent) variable in L1 and your response (or dependent) variable in L2. To make a scatterplot: 1. From the STAT PLOTS menu, turn on one plot. 2. For Type, choose the very first option as in the screen to the right. Be sure to press [ after your selection. 3. Xlist contains the list name of your explanatory variable, L1. To type in L1, press F and 1. 4. Ylist contains the list name of your response variable, L2. To select that name, press F and 2. 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 select it. 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 ISBN-10: 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 by n. 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, Hi...
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