Use The Sample Data And Confidence Level Given Below To Complete Parts A Through D A Research Institute Poll Asked 1 (27.96 KiB) Viewed 18 times
Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=1014 and x = 576 who said "yes." Use a 95% confidence level. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E=0 (Round to three decimal places as needed.) c) Construct the confidence interval. ARIES <p< (Round to three decimal places as needed.) d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below. O A. One has 95% confidence that the sample proportion is equal to the population proportion. O B. 95% of sample proportions will fall between the lower bound and the upper bound. O C. There is a 95% chance that the true value of the population proportion will fall between the lower bound and the upper bound. O D. One has 95% confidence that the interval from the lower bound to the upper bound actually does contain the true value of the population proportion.
An IQ test is designed so that the mean is 100 and the standard deviation is 13 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 99% confidence that the sample mean is within 6 IQ points of the true mean. Assume that o= 13 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. The required sample size is. (Round up to the nearest integer.) Would it be reasonable to sample this number of students? O Yes. This number of IQ test scores is a fairly large number. o Yes. This number of IQ test scores is a fairly small number. No. This number of IQ test scores is a fairly small number. O No. This number of IQ test scores is a fairly large number. O
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