Give the equation
Y= 1/5×-5+1

709

Step-by-step explanation:

Sample size for an Interval estimate of population proportion is

n = (zα/2)^2 p (1-p) / E^2

given:

proportion, p = 0.21

margin of error, E = 0.03

Confidence level of 95%, that means the the siginficance level α is 1 – p

α = 1 – 0.95 = 0.05

Z(α /2) = Z(0.05/2) = Z (0.025)

Using a z table Z = 1.96

n = (zα/2)^2 p (1-p) / E^2

n = 1.96^2*0.21 (1-.21)/0.03^2

n = 708.13 ≈ 709