n. Assume that the population distribution of zinc mass for AAA batteries is unknown, but its standard deviation is know

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N Assume That The Population Distribution Of Zinc Mass For Aaa Batteries Is Unknown But Its Standard Deviation Is Know 1 (69.37 KiB) Viewed 24 times

n. Assume that the population distribution of zinc mass for AAA batteries is unknown, but its standard deviation is known as 0.03 grams according to one study. A researcher has collected a random sample of 100 AAA batteries and the sample mean zin mass for 100 AAA batteries was 2 grams. If the researcher wants to construct a 95% confidence interval for the population mean zinc mass for AAA batteries, which of the following statements is TRUE? (1) Since the population distribution is unknown, we can't construct the confidence interval. (2) The standard error of the mean is 0.03 grams. (3) The critical value for the 95% confidence interval is 1.645. (4) If the researcher collects more sample than 100 AAA batteries, then the resulting confi- dence interval will become wider. (5) None of the above