p = 0.20, n = 100.
Approximately, what is P(p̂ < 0.15)?
- A
0.2500
- B
0.0500
- Ccheck_circle
0.1056
- D
0.4013
Explanation
σ_p̂ = √(0.2·0.8/100) = 0.04. z = (0.15−0.20)/0.04 = −1.25. P(Z < −1.25) ≈ 0.1056.
Sampling Distributions for Sample Proportions
AP Statistics· difficulty 3/5
Want 10 more like this — adaptive to your weak spots?