Unit 6: Inference for Proportions

Question 1

Standard Error (SE)

Answer 1

SE: Estimate of standard deviation
SE = √[p(1 − p) / n]

Question 2

Confidence Interval

Answer 2

p̂: Sample proportion
z: Test statistic for proportion
p̂ ± z × √[p̂(1 − p̂) / n]

Question 3

z-Test for Proportion:

Answer 3

p₀: Null hypothesis proportion
z = (p̂ − p₀) / √[p₀(1 − p₀) / n]