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A researcher wishes to? estimate, with 90?% ?confidence, the population proportion of adults who eat fast...

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Basic Math

A researcher wishes to? estimate, with 90?% ?confidence, thepopulation proportion of adults who eat fast food four to six timesper week. Her estimate must be accurate within 5?% of thepopulation proportion. ?

(a) No preliminary estimate is available. Find the minimumsample size needed. ?

(b) Find the minimum sample size? needed, using a prior studythat found that 40?% of the respondents said they eat fast foodfour to six times per week. ?

(c) Compare the results from parts? (a) and? (b).

Answer & Explanation Solved by verified expert
3.9 Ratings (524 Votes)
a Nopreliminary estimate is availableThe ME Zcritical SQRTp qSquaring and solving n ZcME2 p qHere ME 5 005 p 05    See Answer
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