EXAMPLE 3 Calculating

Suppose the observed frequencies of browser preference in Table 3 come from a survey taken this year of 200 Internet users.

Table 11.3: Table 3 Observed frequencies of browser preference in a sample of 200 Internet users
Browser Observed frequency
Google Chrome 80
Microsoft Internet Explorer 62
Other 58

Calculate the test statistic by comparing the observed frequencies from Table 3 with the expected frequencies calculated in Table 2 of Example 2.

Solution

The observed frequencies are found in Table 3, and the expected frequencies are given in Table 2. Table 4 then provides the quantities needed to calculate . Then

Table 11.4: Table 4 Calculating
Category
Chrome 0.32 80 64 16 256
IE 0.31 62 62 0 0
Other 0.37 58 74 −16 −256

NOW YOU CAN DO

Exercises 13–18.