Use the given data to find the minimum sample size required to estimate a population proportion or percentage.

Question

Margin of error: five percentage points; confidence level 90% from a prior study, ^p is estimated by the decimal equivalent 56%

n= (Round up to the nearest integer)

Answer 1

Formula to find sample size:

n = [(z-value)^2 * p * q]/E^2
... where n = sample size, z-value is found using a z-table for 90% confidence, p = .56, q = 1 - p, ^2 means squared, * means to multiply, and E = .05.

Plug values into the formula and calculate n.