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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Quizplus · Accepted Answer

The correct formula for determining the number of degrees of freedom for the t distribution, when comparing the means of two populations with equal variances, is the sum of the sample sizes of both groups minus 2. This accounts for the estimation of two parameters (the means of the two populations).

To Develop a Confidence Interval for the Difference Between the Means