Question
6.3 Q9 A researcher wishes toestimate, with 95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her
6.3
Q9
A researcher wishes toestimate, with 95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 1% of the true proportion.
(a) No preliminary estimate is available. Find the minimum sample size needed.
(b) Find the minimum sample sizeneeded, using a prior study that found that 18% of the respondents said they think Congress is doing a good or excellent job.
(c) Compare the results from parts(a) and(b).
Q10
A researcher wishes toestimate, with 95% confidence, the population proportion of adults who support labeling legislation for genetically modified organisms(GMOs). Her estimate must be accurate within 4% of the true proportion.
(a) No preliminary estimate is available. Find the minimum sample size needed.
(b) Find the minimum sample sizeneeded, using a prior study that found that 79% of the respondents said they support labeling legislation for GMOs.
(c) Compare the results from parts(a) and(b).
Q13
Translate the statement into a confidence interval. Approximate the level of confidence.
In a survey of 1021 adults in acountry, 78% said being able to speak the language is at the core of national identity. Thesurvey's margin of error is 3.9%.
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