Unit 2: Descriptive Statistics
Outline
2.1 Types of Figures
• Histogram: Continuous • Bar Graph: Categorical • Frequency Polygon |
2.2 Shapes of Curves
2.3 Measures of Central Tendency
• Mean: The average • Median: The middle • Mode: The highest frequency |
• Range: the difference between the highest score and the lowest score in a set of scores. • Interquartile Range: The range of the middle 50% (IQR = Q3 – Q1). • Standard Deviation: The measure that indicates the degree to which the scores vary from the mean |
2.5 The 68-95-99.7 Rule for Normal Distributions
• 68% of scores lie within one standard deviation from the mean. • 95% of scores lie within two standard deviations from the mean. • 99.7% of scores lie within three standard deviations from the mean. |
Resources
![](https://psychwest.org/wp-content/uploads/2019/07/lecture.png)
Lecture
Notes
![This image has an empty alt attribute; its file name is worksheet-1.png](https://psychwest.org/wp-content/uploads/2019/07/worksheet.png)
Work
Sheet
![This image has an empty alt attribute; its file name is project.png](https://psychwest.org/wp-content/uploads/2019/07/project.png)
Unit
Project
![This image has an empty alt attribute; its file name is review.png](https://psychwest.org/wp-content/uploads/2019/07/review.png)
Study
Guide
![](https://psychwest.org/wp-content/uploads/2019/11/Score.png)
Self-Scorers:
Descriptive Statistics
Do not request access. Use your google account (or create one for free). Open the spreadsheet, click on <File> and <Make a copy>. Enter your data. Errors will be highlighted. When the project is complete/correct, record your receipt number. |