A researcher wishes to estimate, with 95% confidence, the population proportion of adults who support labeling legislation for genetically modified organisms (GMOs). Her estimate must be accurate within 3% of the true proportion.
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- A researcher wishes to estimate, with 95% confidence, the population proportion of adults who eat fast food four to six times per week. Her estimate must be accurate within 4% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 26% of the respondents said they eat fast food four to six times per weekA tv sports commenter wants to estimat th proportion of citizens who "follow professional football." a) what sample size should be obtained if he wants to be within 3 percentage points with 94% confidence if he uses an estimate of 54% obtained from a poll?A researcher wishes to estimate, with 95% confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate must be accurate within 2% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 22% of motor vehicle fatalities that were caused by alcohol-impaired driving. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n=nothing (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 22% of motor vehicle fatalities that were caused by alcohol-impaired driving? n=nothing (Round up to the nearest whole number as needed.) (c) How do the results from (a) and (b) compare? A. Having an…
- A researcher wishes to estimate, with 95% confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate must be accurate within 3% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 32% of motor vehicle fatalities that were caused by alcohol-impaired driving. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n=nothing (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 32% of motor vehicle fatalities that were caused by alcohol-impaired driving? n=nothing (Round up to the nearest whole number as needed.) (c) How do the results from (a) and (b) compare? A. Having an estimate of…A television sports commentator wants to estimate the proportion of citizens who follow professional football. What sample size should be obtained if he wants to be within 4 percentage points with 96% confidence, if he uses an estimate of 54% obtained from a poll? What sample size should be obtained if he wants to be within 4 percentage points with 96% confidence if he does not use any prior estimates? Why are the results so close?