2 The claim is that the proportion of adults who smoked a ci

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The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.25, and the sample statistics include?

n=1283 subjects with 295 saying that they smoked a cigarette in the past week. Find the value of the test statistic.

The test statistic is______

(Round to two decimal places as needed.)

Solution

p-hat = 295/1283 = 0.229

q = 1-0.25 = 0.75

z= (p hat - p)/ sqrt(pq / n)

= (0.229 - 0.25)/sqrt(0.25*0.75/1283) = -1.737

Answer: -1.737