Conservative Degrees Of Freedom
A 95% confidence interval for the difference in mean reaction times between two drugs will be constructed using the following sample statistics: n₁=15, x̄₁=0.38 seconds, s₁=0.12 seconds, and n₂=12, x̄₂=0.45 seconds, s₂=0.15 seconds. Which of the following conditions would necessitate using the conservative approach to determine the degrees of freedom?
A
If the samples are independent
B
If the population variances are unequal
C
If both samples come from normal distributions
D
If both sample sizes are less than 30
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