Question

Marketing companies are interested in knowing the population percent of women who make the majority of household purchasing decisions.

a) When designing a study to determine this population proportion, what is the minimum number you would need to survey to be 90% confident that the population proportion is estimated to within 0.05? (Round your answer up to the nearest whole number.)

b) Suppose a marketing company did do a survey. They randomly surveyed 200 households and found that in 120 of them, the woman made the majority of the purchasing decisions. We are interested in the population proportion of households where women make the majority of the purchasing decisions.
Identify the following. (Enter exact numbers as integers, fractions, or decimals.)

1) x

2) n

3) p'

Answer 1