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AP Statistics/Unit 5: Sampling Distributions
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Probability for Difference in Sample Means
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Two independent random samples, of sizes $$n_1 = 36$$ and $$n_2 = 64$$, are selected from two normally distributed populations. The first population has a mean of $$μ_1 = 75$$ and a standard deviation of $$σ_1 = 12$$. The second population has a mean of $$μ_2 = 68$$ and a standard deviation of $$σ_2 = 15$$. What is the probability that the difference between the sample means, ($$\bar{x}_1 - \bar{x}_2$$), is greater than 10?

A

0.1314

B

0.9938

C

0.0228

D

0.5000

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