Suppose we take a random sample of no observations from a normal population with known standard deviation o = 40. We obtain the sample mean x=136. Construct a 95% confidence interval for the population mean using the following sample sizes: n= 20, b. n=80, c. n=160.
Added by Joanna S.
Step 1
For n = 20: SEM = 40 / sqrt(20) = 40 / 4.47 ≈ 8.94 For n = 80: SEM = 40 / sqrt(80) = 40 / 8.94 ≈ 4.47 For n = 160: SEM = 40 / sqrt(160) = 40 / 12.65 ≈ 3.16 Show more…
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