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To find P (68 ≤ ≤ 73), describe the distribution of sample means.
Suppose that x has distribution with μ = 72 and σ =8.
(a) If random samples of size n = 9 are selected, can we say anything about the distribution of sample means?
(b) If the original x distribution is normal, can we say anything about the distribution of random samples of size 16? Find P (68 ≤ ≤ 73).
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What is the expected shape of the distribution of the sample mean?
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Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
Find the standard error of the difference in sample means,
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