In a survey conducted by a reputable marketing agency, 243 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). ... (a) What is the sample in this study? What is the population of interest? Determine the sample in this study. Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The sample is all adults. O B. The sample is the adults 19 years of age or older. (Type a whole number.) OC. The sample is all adults 19 years of age or older. O D. The sample is all adults with a cell phone. Determine the population of interest. Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The population is all adults. O B. The population is all adults 19 years of age or older. OC. The population is all adults with a cell phone. O D. The population is the (Type a whole number.) adults 19 years of age or older. (b) What is the variable of interest in this study? Is it qualitative or quantitative? The variable of interest is This variable is because (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. (Round to three decimal places as needed.) (d) Explain why the point estimate found in part (c) is a statistic. Explain why it is a random variable. What is the source of variability in the random variable? Why is the point estimate found in part (c) a statistic? O A. It is being used to make inferences. O B. Its value is based on a sample. OC. The sample size is large. O D. Its value may change depending on the individuals in the survey. O E. It is information obtained from a survey. Why is the point estimate found in part (c) a random variable? O A. Its value is based on a sample. O B. The sample size is large. OC. It is being used to make inferences. O D. Its value may change depending on the individuals in the survey. O E. It is information obtained from a survey. What is the source of variability in the random variable? O A. The individuals selected to be in the study O B. The question asked in the survey OC. The sample size O D. Random errors (e) Construct and interpret a 95% confidence interval for the population proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom. Select the correct choice below and fill in any answer boxes within your choice. (Type integers or decimals rounded to three decimal places as needed. Use ascending order.) O A. We are % confident the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom is between and O B. There is a % probability the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom is between and (f) What ensures that the results of this study are representative of all adults 19 years of age or older? O A. Random sampling O B. The large sample size OC. Sampling from adults 19 years of age or older O D. The high confidence level