Independent Samples Are Obtained from Two Normal Populations with Unknown

question 26

Multiple Choice

Independent samples are obtained from two normal populations with unknown but equal standard deviations (variances) in order to construct a hypothesis test for the difference between the population means.If the first sample contains 20 items and the second sample contains 25 items, the correct form to use for the sampling distribution is the

• A)normal distribution
• B)t distribution with 43 degrees of freedom
• C)t distribution with 45 degrees of freedom
• D)F distribution with 20 and 25 degrees of freedom
• E)none of the above