University of Phoenix Material
Week 2 Practice Worksheet
Prepare a written response to the following questions.
Chapter 3
1. For the following scores, find the mean, median, and the mode. Which would be the most appropriate measure for this data set?
2, 2, 0, 5, 1, 4,1, 3, 0, 0, 1, 4, 4, 0,1, 4, 3, 4, 2, 1
Mean: 2.1
Median: 2
Mode: 1, 4
2. Based on the scale of measurement for each variable listed below, which measure of central tendency is most appropriate for describing the data?
a. The time (in years) it takes a sample of students to graduate college- the mode
b. The blood type (e.g., Type A, B, AB, O) of a group of participants- the median
c. The rankings of college undergraduate academic programs-the mean
Chapter 4
3. An expert reviews a sample of 10 scientific articles (n = 10) and records the following numbers of error in each article: 0, 4, 2, 8, 2, 3, 1, 0, 5, and 7. Compute the SS, the variance, and the standard deviation for this sample using the definitional and computational formulas.
SS: 172
COMPUTE SS: 17.2
Variance: 7.73
Standard deviation: sample 2.7/ population 2.6
4. A psychologist interested in political behavior measured the square footage of the desks in the official office for four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations. The figures for the governors were 44, 36, 52, and 40 square feet. The figures for the CEOs were 32, 60, 48, 36 square feet.
a. Figure the means and standard deviations for the governors and CEOs.
Mean: 43.5
Standard deviations: population 9.4 sample 8.8
Explain, to a person who has never had a course in statistics, what you have done.
Standard deviation is the average or mean of all the averages for multiple sets of data. To do this, add up all the numbers in a data set and divide by the total number of pieces of data.
b. Note the ways in which the means and standard deviations differ, and speculate on the...