1.. In a survey of 2266 adults, 746 say they believe in UFOs. Construct a 99% confidence interval for the population pro
Posted: Mon Jul 11, 2022 11:23 am
1.. In a survey of 2266 adults, 746 say theybelieve in UFOs. Construct a 99% confidence intervalfor the population proportion of adults who believe in UFOs.
2.. A researcher wishes to estimate,with 99% confidence, the population proportion ofadults who think Congress is doing a good or excellent job. Herestimate must be accurate within 4% of the trueproportion.
(a) No preliminary estimate is available. Find the minimumsample size needed.
(b) Find the minimum sample size needed, using a priorstudy that found that 38% of the respondents said theythink Congress is doing a good or excellent job.
(c) Compare the results from parts (a) and (b).
2.. A researcher wishes to estimate,with 99% confidence, the population proportion ofadults who think Congress is doing a good or excellent job. Herestimate must be accurate within 4% of the trueproportion.
(a) No preliminary estimate is available. Find the minimumsample size needed.
(b) Find the minimum sample size needed, using a priorstudy that found that 38% of the respondents said theythink Congress is doing a good or excellent job.
(c) Compare the results from parts (a) and (b).