Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
Use the empirical rule to test for normality. See the sampling distribution of sample means and the central limit theorem develop from your own data!
Consider a population with μ = 43 and σ = 5.2.
State the null and alternative hypotheses for each of the following:
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