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 \(\boxed{0.221}\).