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what is the source of variability in the random variable?

what is the source of variability in the random variable?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Solve the last part 

what is the source of variability in the random variable?

B. The sample size was weing

In a survey conducted by a reputable marketing agency, 277 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. 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 (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= 277 (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? A. Its value is based on a specific sample. OB. The sample size is large. OC. It is being used to make inferences. OD. All pieces of information obtained from surveys are statistics. OE. Its value may change depending on the individuals in the survey Why is the point estimate found in part (c) a random variable? OA. It is being used to make inferences. B. Its value may change depending on the individuals in the survey. OC. All pieces of information obtained from surveys are statistics. OD. The sample size is large. OE. Its value is based on a specific sample. What is the source of variability in the random variable? OA. The marketing agency OB. The sample size OC. The question asked in the survey OD. The individuals selected to be in the study 4
Transcribed Image Text:In a survey conducted by a reputable marketing agency, 277 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. 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 (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= 277 (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? A. Its value is based on a specific sample. OB. The sample size is large. OC. It is being used to make inferences. OD. All pieces of information obtained from surveys are statistics. OE. Its value may change depending on the individuals in the survey Why is the point estimate found in part (c) a random variable? OA. It is being used to make inferences. B. Its value may change depending on the individuals in the survey. OC. All pieces of information obtained from surveys are statistics. OD. The sample size is large. OE. Its value is based on a specific sample. What is the source of variability in the random variable? OA. The marketing agency OB. The sample size OC. The question asked in the survey OD. The individuals selected to be in the study 4
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