Confidence Level and Interval Width
In a study comparing two teaching methods, 45 of 80 students using Method A passed an exam, and 60 of 90 students using Method B passed. The conditions for inference have been verified. Which statement describes a primary consequence of constructing a 99% confidence interval for p₁ - p₂, the true difference in proportions?
A
The sample sizes are too small for a valid interval
B
The interval would be wider due to the larger z* multiplier
C
The formula doesn’t apply when proportions differ by >10%
D
The standard error decreases at higher confidence levels
Question Leaderboard
Not enough data yet to show leaderboard.