Two separate samples are being used to estimate the population mean difference b

Question

Two separate samples are being used to estimate the population mean difference between two treatment conditions. Which of the following would produce the widest confidence interval?

n1 =  n2 = 20 with a pooled variance of 100

n1 = n2 = 10 with a pooled variance of 100

n1 =  n2 = 10 with a pooled variance of 10

n1 =  n2 = 20 with a pooled variance of 10

n1 =  n2 = 20 with a pooled variance of 100

n1 = n2 = 10 with a pooled variance of 100

n1 =  n2 = 10 with a pooled variance of 10

n1 =  n2 = 20 with a pooled variance of 10

Explanation / Answer

Answer: b. n1 = n2 = 10 with a pooled variance of 100

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