1. Appendix A

2. Descriptive Statistics

3. Statistics used to organize and summarize data in a meaningful way

4. Frequency Distributions

5. A summary of how often various scores occur in a sample of scores. Score values are arranged in order of magnitude, and the number of times each score occurs is recorded

6. Histogram

7. A way of graphically representing a frequency distribution; a type of bar chart that uses vertical bars that touch

8. Frequency polygon

9. a way a graphically representing a frequency distribution; frequency is marked above each score category on the graph’s horizontal axis, and the marks are connected by straight lines

10. Skewed Distributions

11. An asymmetrical distribution; more scores occur on one side than the other; In a positively skewed distribution, more scores are low

12. Symmetrical Distribution

13. A distribution in which the scores fall equally on both sides of the graph, the normal curve is an example

14. Measure of Central Tendency

15. A single number that presents some information about the “center” of a frequency distribution

16. Mode

17. The most frequent occurring score in a distribution

18. Median

19. The score that divides a frequency in half, so that the same number of scores lie one both sides

20. Mean

21. The sum of a set of scores in a distribution divided by the number of scores; the mean is usually the most representative measure of central tendency

22. Measure of Variability

23. A single number that presents information about the spread of scores in a distribution

24. Range

25. A measure of variability; the highest score distribution minus the lowest score

26. Standard Deviation

27. A measure of variability; expressed as the square root of the sum of the squared deviations around the mean divided by the number of scores in the distribution

28. z Score

29. A number, expressed in standard deviation units, that shows a score’s deviation from the mean

30. Standard Normal Curve

31. A symmetrical distribution forming a bell- shaped curve in which the mean, median, and mode are all equal and fall in the exact middle

32. Correlation

33. The relationship between two variables

34. Correlation Coefficient

35. A measure of the magnitudes and directions of the relationships between two variables. The closer the correlation is to +1 or –1, the stronger the relationship is. A positive correlation coefficient indicates that as one variable increase, the other tends to increase, the negative correlation coefficient indicates as one variable increases, the other tends to decrease

36. Scatter Diagram

37. A graph that represents the relationship between two variables

38. Inferential Statistics

39. Statistical techniques that allow researchers to determine whether the outcomes in a study are likely to be more than just chance events and whether they can legitimately generalized to a larger population

40. Population

41. A complete set of something-people, nonhuman animals, objects, or events

42. Sample

43. A subset of a population