Two-Proportion Z-Interval Calculation Error
In a study on voting patterns, a survey found that 215 out of 300 women and 240 out of 400 men voted in a recent election. A 95% confidence interval for the difference in the proportions of voters between women and men, , was calculated with a margin of error of 0.062. Which of the following is the most likely explanation for the error in this calculation?
A
Reversing the order of subtraction (p̂men - p̂women)
B
Using z* = 1.645 instead of z* = 1.96
C
Incorrect substitution of sample proportions in the formula
D
Using n₁ + n₂ instead of individual sample sizes
Question Leaderboard
Not enough data yet to show leaderboard.