As part of a study of natural variation in blood chemistry, serum potassium concentrations were measured in 84 healthy women. The mean concentration was 4.36 mEq/1, and the standard deviation was 0.42 mEq/1. The table presents a frequency distribution of the data.54

(a) Calculate the standard error of the mean.
(b) Construct a histogram of the data and indicate the intervals ± SD and ± SE on the histogram. (See Figure 6.2.1.)
(c) Construct a 95% confidence interval for the population mean.
(d) Interpret the confidence interval you found in part (c). That is, explain what the numbers in the interval mean.

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Serum potassiumNumber of (mEq/l) women 3.4,3.7) 3.240) 14.0,43) 4.3,4.628 4.6,49) 149,5.2) 5.2.5.5) 5.5.5.8) 16 Total 84