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Constructing and Interpreting Confidence Intervals. In
Chapter 7, Problem 13BSC(choose chapter or problem)
Problem 13BSC
Constructing and Interpreting Confidence Intervals. In Exercises use the given sample data and confidence level. In each case, (a) find the best point estimate of the population proportion p; (b) identify the value of the margin of error E; (c) construct the confidence interval; (d) write a statement that correctly interprets the confidence interval.
From a KRC Research poll in which respondents were asked if they felt vulnerable to identity theft: n = 1002, x = 531 who said “yes.” Use a 95% confidence level.
Questions & Answers
QUESTION:
Problem 13BSC
Constructing and Interpreting Confidence Intervals. In Exercises use the given sample data and confidence level. In each case, (a) find the best point estimate of the population proportion p; (b) identify the value of the margin of error E; (c) construct the confidence interval; (d) write a statement that correctly interprets the confidence interval.
From a KRC Research poll in which respondents were asked if they felt vulnerable to identity theft: n = 1002, x = 531 who said “yes.” Use a 95% confidence level.
ANSWER:
Answer
Step 1 of 4
Given x=531, n=1002
a)The best point estimate of the population proportion p=x/n
=531/1002
=0.53
q=1-p
=1-0.53
=0.47