APPENDIX II
Statistics in Psychological Research

1. Describe the differences between descriptive and inferential statistics. (see introductory section; see also Descriptive Statistics and Inferential Statistics)
   
   
2. Define null hypothesis. (see Describing Data)
   
   
3. Describe a frequency histogram, and explain why it is used. (see The Frequency Histogram)
   
   
4. Name the four basic categories of descriptive statistics. (see Descriptive Statistics)
   
   
5. Define measure of central tendency, and describe the three measures of central tendency. (see Measures of Central Tendency)
   
   
6. Explain how to calculate the mean, median, and mode for a given data set. (see Measures of Central Tendency)
   
   
7. Define measure of variability, and describe the two measures of it. (see Measures of Variability)
   
   
8. Discuss the features of a normal distribution. (see The Normal Distribution)
   
   
9. Define percentile score and standard score, and explain how to use each one. (see The Normal Distribution)
   
   
10. Define correlation. Specify the formula for computing a correlation coefficient. (see Correlation)
    
    
11. Define t test. Specify the formula for calculating a t value as well as the procedures for interpreting it. (see Differences Between Means: The t Test)
    
    
12. Define degrees of freedom. (see Differences Between Means: The t Test)
    
    
13. Define analysis of variance, and explain when this statistic is used. (see Beyond the t Test)