use the sample mean ar{x} to predict mu by calculating the interval for mu with a level of confidence of 100(1 - alpha)%.] (c) Assume a person conducts a survey and obtains the heights of n = 2000 adults of ages 20-29 in a certain city of Vietnam. He finds that the sample mean height (of 2000 adults above) is ar{x} = 162.5 cm. Assume the standard deviation of the whole population in this city is sigma = 7 cm. Use the C.I to forecast the mean height mu of all adults of ages 20-29 in this city.
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The level of confidence represents the expected proportion of intervals that will contain the population mean if we draw a large number of independent random samples. The formula for a confidence interval is: \[ \bar{x} \pm Z_{\alpha/2} \cdot Show more…
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