Question
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who eat fast...
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 5% 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 20% of the respondents said they eat fast food four to six times per week.
(c) Compare the results from parts (a) and (b).
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