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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Definitions:

Undesirable Behavior

Actions or reactions that are not wanted or considered negative in a particular context.

Unpleasant Consequence

A negative outcome or punishment that follows an undesired behavior, used to decrease the likelihood of that behavior occurring again in the future.

Aversion Therapy

A form of psychological treatment where undesirable behaviors are paired with unpleasant stimuli to reduce the behavior.

Nail-Biting

A common oral compulsive habit or behavior often associated with anxiety or stress.