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|
|Number of Study Participants Completing the Beck Depression Inventory (BDI)||Average Depression Score (BDI)||Amount of dispersion or variation in Depression Score (BDI)|
4. For the following dataset 11, 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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