Calculation practice: Standard error of the mean and approximate confidence intervals for the mean. We will use the same data for systolic blood pressure collected for Calculation Practice Problem 1 in Chapter 3. Here again are the data points:

The mean is 131.0 mm Hg, and the variance is 254.5.

a. What is S^s the standard deviation of these data?

b. What is nⁿ the sample size?

c. Calculate the standard error of the mean.

d. Using the 2SE rule of thumb, calculate an approximate 95% confidence interval for the mean. Provide the lower and upper limits.

Data from practice problem 1

Calculation practice: Basic descriptive stats. Systolic blood pressure was measured (in units of mm Hg) during preventative health examinations on people in Dallas, Texas. Here are the measurements for a subset of these patients.

Transcribed Image Text:

112,112, 128,128, 108,108, 129,129, 125,125, 153,153, 155,155, 132,132, 137137