QuestionClaim: Fewer than $97 \%$ of adults have a cell phone. In a reputable poll of 1091 adults, $92 \%$ said that they have a cell phone. Find the value of the test statistic.
The value of the test statistic is $\square$ (Round to two decimal places as needed.)

Studdy Solution
Compute the test statistic (z) using the formula:
$$z = \frac{\hat{p} - p_0}{SE}$$
Substitute the values:
$$z = \frac{0.92 - 0.97}{0.00517}$$
$$z = \frac{-0.05}{0.00517}$$
$$z \approx -9.67$$
The value of the test statistic is:
$$\boxed{-9.67}$$