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In a survey conducted by a reputable marketing agency, 221 of 1000 adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom (confessions included texting and answering phone calls). Complete parts (a) through (f) below.
Click here to view the standard normal distribution table (page 1).
Click here to view the standard normal distribution table (page 2).
Uetermine the population of interest. Select the correct choice below and, it necessary, fill in the answer box within your choice.
A. The population is the adults 19 years of age or older.
(Type a whole number)
B. The population is all adults 19 years of age or older.
C. The population is all adults
D. The population is all adults with a cell phone.
(b) What is the variable of interest in this study? Is it qualitative or quantitative?
The variable of interest is bringing one's cell phone every trip to the bathroom. This variable is qualitative with two outcomes because individuals are classified based on a characteristic
(c) Based on the results of this survey, obtain a point estimate for the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom.
\[
\hat{\mathrm{p}}=\square
\]
(Round to three decimal places as needed)
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Final Answer: The point estimate for the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom is \(\boxed{0.221}\).
Step 1 ：The population of interest is all adults 19 years of age or older.
Step 2 ：The variable of interest is bringing one's cell phone every trip to the bathroom. This variable is qualitative with two outcomes because individuals are classified based on a characteristic.
Step 3 ：The point estimate for the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom can be calculated by dividing the number of adults who confessed to bringing their cell phone every trip to the bathroom by the total number of adults surveyed. In this case, the number of adults who confessed is 221 and the total number of adults surveyed is 1000.
Step 4 ：Using these values, the point estimate is calculated as \(\frac{221}{1000} = 0.221\).
Step 5 ：Final Answer: The point estimate for the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom is \(\boxed{0.221}\).
