(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. Its value may change depending on the individuals in the survey. B. The sample size is large. O C. Its value is based on a sample. O D. It is information obtained from a survey. O E. It is being used to make inferences. Why is the point estimate found in part (c) a random variable? A. The sample size is large. B. It is information obtained from a survey. C. It is being used to make inferences. D. Its value is based on a sample. O E. Its value may change depending on the individuals in the survey. What is the source of variability in the random variable? O A. The sample size B. The question asked in the survey OC. The individuals selected to be in the study 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. 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 O B. 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 (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 high confidence level O C. The large sample size O D. Sampling from adults 19 years of age or older