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PSYCH 625 Week 1 Individual Assignment Time to Practice – Week One

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Part A

Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Test Resources link.

1. By hand, compute the mean, median, and mode for the following set of 40 reading scores

2. Compute the means for the following set of scores saved as Ch. 2 Data Set 3 using IBM® SPSS® Print out a copy of the output.

3. You are the manager of a fast food store. Part of your job is to report which special is selling best to the boss at the end of each day. Use your knowledge of descriptive statistics and write one paragraph to let the boss know what happened today. Use the following data. Do not use IBM® SPSS® software to compute the statistics needed; rather, do it by hand. Include a copy of your work

4. Suppose you are working with a data set that has some different (much larger or much smaller than the rest of the data) scores. What measure of central tendency would you use and why

5. For the following set of scores, compute the range, the unbiased and the biased standard deviations, and the variance. Do the exercise by hand

6. Use IBM® SPSS® software to compute all the descriptive statistics for the following set of three test scores over the course of a semester. Which test had the highest average score? Which test had the smallest amount of variability

7. This practice problem uses the data contained in the file named Ch. 3 Data Set 3. There are two variables in this data set

8. Review the following frequency distribution. Create a histogram either by hand or by using some other application such as a Microsoft® Excel® document

9. A third-grade teacher is looking to improve her students’ level of engagement during group discussions and instruction. She keeps track of each of the 15 third graders’ number of responses every day for 1 week. This information is available in Ch. 4 Data Set 2. Use IBM® SPSS® software to create a bar chart (one bar for each day).

10. Identify whether these distributions are negatively skewed, positively skewed, or not skewed at all, and why

11. For each of the following, indicate whether you would use a pie, line, or bar chart, and why

Part B

Complete the questions below. Be specific and provide examples when relevant.

Cite any sources consistent with APA guidelines

Salkind (2011) describes statistics as a “set of tools” (p. 18). How do behavioral scientists use those tools

How would you use descriptive statistics to report the effectiveness of a baseball team? How would you use inferential statistics to report the effectiveness of a baseball team? In this example, what is the sample and what is the population

What does a measure of central tendency tell us about a data set? Identify the three common measures of central tendency used in descriptive statistics and give an example of each. How do you calculate them

What is variability in a data set? Identify three measures of variability used in descriptive statistics, explain how to calculate each, and give an example of each


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