APFIVE Two-Proportion Z-Interval Calculation Error
A researcher studying gender differences in voting behavior found that 215 of 300 women and 240 of 400 men voted in a recent election. If the margin of error for a 95% confidence interval for (p̂women - p̂men) is 0.062, what is the most likely explanation for an error in the calculation?
A
Using z* = 1.645 instead of z* = 1.96
B
Reversing the order of subtraction (p̂men - p̂women)
C
Incorrect substitution of sample proportions in the formula
D
Using n₁ + n₂ instead of individual sample sizes
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