John Wiley & Sons TI-83 Manual do Utilizador descarregar pdf (Página 11)

Chapter

Organizing Data

After the data has been input into the calculator one of the tasks of the statistician is to try to

make sense of that data by organizing it. As a consumer of statistics, you are presented with

tables and graphical displays of data on a daily basis. This chapter focuses on ways of

organizing data on the TI-83, TI-83 Plus, and TI-84 Plus calculators.

Frequency Distributions

One of the simplest ways of organizing data is to group together similar values. Once we’ve

grouped them together we can count how many elements there are in each group. Since the TI-

83, TI-83 Plus, and TI-84 plus calculators work only with numerical data, we will be trying to

group numbers together.

To get some idea of how the numbers are distributed, we will split them into intervals or classes,

all of the same width, and count how many are in each class. Listing the classes and their

frequencies provide us with information to create a frequency distribution. The calculators do

not provide us directly with a frequency distribution, but it will construct a frequency histogram

for us which helps us create the frequency distribution.

Example: Home Runs

The following table lists the number of home runs hit by major league baseball teams during the

2002 season. Enter the number of home runs into a list labeled RUNS. By inspection we can see

that the values go from 124 to 230. This gives us a range of 230 − 124 = 106. To find the class

width we divide the range by the number of classes we desire. We will construct the frequency

distribution with five classes. Dividing the range 106 by 5 the number of classes gives us a class

width of 22.

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John Wiley & Sons TI-83 Manual do Utilizador Página 11