mathxl.com/Student/PlayerTest.aspx?testld=232316947¢erwin=yes STA 2122 Hybrid Fall 2021 E Quiz: Chapter 9 Quiz Question 7 of 10 This quiz: 10 point(s) possible This question: 1 point(s) possible In a survey conducted by a reputable marketing agency, 256 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. (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 the adults 19 years of age or older. Type a whole number.) O B. The sample is all adults. O C. The sample is all adults with a cell phone. O D. The sample is all adults 19 years of age or older. 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 cell phone users. O C. The population is the adults 19 years of age or older. Type a whole number.) D. The population is all 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. P = 0 (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. Its value may change depending on the individuals in the survey. Statcrunch Calculator Time Remaining: 00:38:51 Nextmathxl.com/Student/PlayerTest.aspx?testld=232316947¢erwin=yes STA 2122 Hybrid Fall 2021 = Quiz: Chapter 9 Quiz Question 7 of 10 This quiz: 10 point(s) possible This question: 1 point(s) possible In a survey conducted by a reputable marketing agency, 256 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. (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. O B. The sample size is large. O C. Its value is based on a specific sample. O D. It is being used to make inferences. O E. All pieces of information obtained from surveys are statistics. Why is the point estimate found in part (c) a random variable? O A. It is being used to make inferences. O B. All pieces of information obtained from surveys are statistics. O C. Its value is based on a specific sample. O D. Its value may change depending on the individuals in the survey. O E. The sample size is large. What is the source of variability in the random variable? O A. The marketing agency O B. The question asked in the survey O C. The individuals selected to be in the study O D. The sample size (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. Statcrunch Calculator Time Remaining: 00:38:38 Nextmathxl.com/Student/PlayerTest.aspx?testld=232316947¢erwin=yes STA 2122 Hybrid Fall 2021 = Quiz: Chapter 9 Quiz Question 7 of 10 This quiz: 10 point(s) possible This question: 1 point(s) possible In a survey conducted by a reputable marketing agency, 256 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. Why is the point estimate found in part (c) a random variable? O A. It is being used to make inferences. O B. All pieces of information obtained from surveys are statistics. O C. Its value is based on a specific sample O D. Its value may change depending on the individuals in the survey. O E. The sample size is large. It is the source of variability in the random variable? O A. The marketing agency O B. The question asked in the survey O C. The individuals selected to be in the study O D. The sample size (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? Select all that apply. A. Sampling from adults 19 years of age or older B. The large sample size C. The high confidence level OD. Random sampling Statcrunch Calculator Time Remaining: 00:38:30 Next