Chapter II Methods for Describing Sets of Data Exercises

2.22 Explain the difference between a bar graph and a histogram.

2.48 Explain the difference between a measure of central tendency and a measure of variability.

2.49 Give three different measures of central tendency

2.51 What two factors affect the accuracy of the sample mean as an estimate of the population mean?

2.52 Explain the concept of a skewed distribution.

2.54 Calculate the mean and median of the following grade point averages:

2.55 Calculate the mode, mean and median of the following data:

2.56 Construct one data set consisting of five measurements and another consisting of six measurements, for which the medians are equal.

2.57 Calculate the mean for samples for which a. n=10 ∑x=85b. n=16 ∑x=400 c. n=45 ∑x=35d. n=18 ∑x=242

2.58 Calculate the mean, median and mode for each of the following samples: a.7, -2, 3, 3, 0, 4 b. 2, 3, 5, 3, 2, 3, 4, 3, 5, 1, 2, 3, 4 c. 51, 50, 47, 50, 48, 41, 59, 68, 45, 37