A company that makes and markets a device that is aimed at helping people quit smoking claims that at least 70 percent of the people who have used the product have quit smoking. To test this, a random sample of n = 100 product users was selected. Of these, 65 people were found to have quit smoking. Given these results, the test statistic value is z = -1.0911.

Question

Quizplus · Accepted Answer

The test statistic is calculated using the formula for a proportion: z = (p̂ - p0) / √(p0(1-p0)/n), where p̂ = 0.65, p0 = 0.70, and n = 100. This results in z ≈ -1.0911.

A Company That Makes and Markets a Device That Is