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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? The mean would be the sum of all numbers which is
2+2+0+ 5+1+ 4+1+ 3+ 0+ 0+ 1+ 4+ 4+ 0+1+ 4+ 3+ 4+ 2+ 1=124. X(sum)/N=124/20. N=6.2.
The median would be the middle score, the sum of all numbers added together (124) and divided by (20)=6.2. This would be the middle score. The mode is the value in a data set that occurs most often or most frequently. 0,0,0,0,1,1,1,1,1,2,2,2,3,3,4,4,4,4,5. We learn in our chapter reading that The mode would be 1. It occurs most frequently. In sum, the mean reflects the distance that each individual score deviates from the balance point of a distribution. The most appropriate I feel for this set would be measuring the scores using the mean.

2, 2, 0, 5,1, 4,1, 3, 0, 0, 1, 4, 4, 0,1, 4, 3, 4, 2, 1

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

b. The blood type (e.g., Type A, B, AB, O) of a group of participants

c. The rankings of college undergraduate academic programs

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 is 3.2. (Sum/count). The variance is 6.96. (Sum of the differences^2) 69.6/10.Standared deviation is 2.638181192. (the square root of the variance). SS = ∑(x-μ)2 Definitional, SS = ∑X2 - (∑X)2/n…...

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