To Develop a Confidence Interval for the Difference Between the Means

question 37

Multiple Choice

To develop a confidence interval for the difference between the means of two populations which are normally distributed and have equal variances,two independent samples of sizes n₁ and n₂ are randomly selected from the two populations.What is the formula used to determine the number of degrees of freedom for the t distribution?

• A)n₁ + n₂
• B)n₁ + n₂ - 1
• C)n₁ + n₂ - 2
• D)n₁ + n₂ + 1

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