Information -A researcher wishes to estimate, with 90% confidence, the population proportion of adults who say chocolate is their favorite ice cream flavor. Her estimate must be accurate within 5% of the population proportion.

section 1 No preliminary estimate is available. the minimum sample size needed n =

section 2 The minimum sample size needed, using a prior study that found that 18% of therespondents said their favorite flavor of ice cream is chocolate. n =

Section 3 Use the results from parts 1 and 2 below are the the choices.

Having an estimate of the population proportion raises the minimum sample size needed.

Having an estimate of the population proportion reduces the minimum sample size needed.

Having an estimate of the population proportion has no effect on the minimum sample size needed