4.3 Practice Problems

1. A study is conducted to estimate the mean total cholesterol level in
children 2-6 years of age. A sample of 9 participants is selected and their
total cholesterol levels are measured as follows.

185 225 240 196 175 180 194 147 223

a. Use the Data Analysis Tool to compute the sample mean, standard deviation
and median.

b. Use the QUARTILE function to compute the first and third quartiles.

2. The following data were collected as part of a study of coffee consumption
among graduate students. The following reflect cups per day consumed:

3 4 6 8 2 1 0 2

a. Use the Data Analysis Tool to compute the sample mean, standard deviation
and median.

b. Use the QUARTILE function to compute the first and third quartiles.

3. In the study of a new anti-hypertensive medication, systolic blood pressures
are measured at baseline (or the start of the study before any treatment is
administered). The data are as follows:

120 112 138 145 135 150 145 163

148 128 143 156 160 142 150

Use Excel functions to compute the sample mean, standard deviation, median and
quartiles.

4. The following are baby height measurements, in cm, for a sample of women
participating in a study of pregnancy outcomes:

28 30 41 48 29 48 62 49 51 39

Use the Data Analysis Tool to compute summary statistics.