Descriptive Statistics

ReviewSheet: Chapter 12 -Descriptive Statistics

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Answer the following items based on the content ofchapter 12, “Descriptive Statistics” from your textbook.

1. The standard deviation is a common measure of variability and a statistic that is often reported in research literature. Using your own words based on your understanding of the reading, what is a standard deviation and why is it important to help understand averages?

2. In the section about percentile ranks and z scores, your book describes the importance of z scores. What is a z score? How is it calculated? Why is it important for helping to understand the true meaning of a raw score?

3. Using APA formatting, how would you present the following descriptive statistics in writing? Use complete sentences.

Number of Senior Citizens	Average Age	Amount of dispersion or variation in age
128	78	3.4

Number of Study Participants Completing the Beck Depression Inventory (BDI)	Average Depression Score (BDI)	Amount of dispersion or variation in Depression Score (BDI)
18	24	5.8

4. For the following dataset11, 8, 9, 12, 9, 10, 12, 13, 11, 13, 12, 6, 10, 17, 13, 11, 12, 12, 14, 14 do the following:

· create a frequency table,

· transform the frequency table into a histogram,

· compute the mean, median, mode, standard deviation, and range, and

· identify the shape of the dataset.

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