Consider Independent Random Samples from Two Normally Distributed Populations

question 83

Multiple Choice

Consider independent random samples from two normally distributed populations.The first population has a mean of μ_x and a variance of and we obtain a random sample of size n_x.The second population has a mean of μ_y and a variance of
And we obtain a random sample of size n_y.The sample means are denoted by
And
) Which of the following formulae calculates the random variable,Z?

• A)Z =
• B)Z =
• C)Z =
• D)Z =

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