Determine on the basis of the sample data shown in the

Question

Use the formula of Exercise 16 to recalculate χ² for Example 10.

Exercise 16

Show that the following computing formula for χ² is equivalent to the formula in Section 7:

Example 10

Determine, on the basis of the sample data shown in the following table, whether the true proportion of shoppers favoring detergent A over detergent B is the same in all three cities: