A variable of two populations has a mean of 40 and a standard deviation of 12 for
Question:
Moreover, the variable is normally distributed on each of the two populations.
a. For independent samples of sizes 9 and 4, respectively, determine the mean and standard deviation of x1 − x2.
b. Can you conclude that the variable x1 − x2 is normally distributed? Explain your answer.
c. Determine the percentage of all pairs of independent samples of sizes 9 and 4, respectively, from the two populations with the property that the difference x1 − x2 between the sample means is between −10 and 10.
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a The mean of x 1 x 2 is 1 2 40 40 0 The standard deviat...View the full answer
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