&6.3.17-T Question Help confidence, the population proportion of adults who thin

Question

&6.3.17-T Question Help confidence, the population proportion of adults who think the president of their country can controf the price of gasoli A re 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 c) Compare the results from parts (a) and (b) ne Her size needed, using a pnor study that found that 36% of the respondents said they think their pr (a) What is the minimum sample size needed assuming that no prior information is available? n(Round up to the nearest whole number as needed)

Explanation / Answer

a)

b)

c)

sample size requirement with a prior estimate is less than no estimate for proportion.

here margin of error E = 0.04 for90% CI crtiical Z          = 1.6449 estimated proportion=p= 0.500 required sample size n =         p*(1-p)*(z/E)2= 423.00

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