t(s) possible In a survey conducted by a reputable marketing agency, 251 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). Why is the point estimate found in part (c) a random variable? OA. It is information obtained from a survey. OB. It is being used to make inferences. OC. The sample size is large. OD. Its value may change depending on the individuals in the survey. OE. Its value is based on a sample. What is the source of variability in the random variable? OA. The individuals selected to be in the study OB. The question asked in the survey OC. The sample size OD. 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.) OA. 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 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? OA. The large sample size OB. Sampling from adults 19 years of age or older