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OIS 2340 MW 2:00 –3:20 OIS 2340 Midterm 1 Study Guide Chapter 1 and Chapter 2 – Intro and Descriptive Stats (mostly terminology) 1.Know how to calculate the number of classes 2.Know/Identify descriptive statistics (know the difference between all) 3.Histogram has no gaps and has number ranges. Bar graph has gaps and has categorical data. Histogram is used for frequency distribution 4.Scatter Diagrams measure cause/effect between two variables. Correlation does not mean causation. 5.Know frequency distributions, relative frequency, and how to create bins for histograms. 6.Look through the first homework; just need to do a lot of remembering. Chapter 3 – Measure of Location and Variability 1.Weighted Average a.GPA exercise in excel b.2.Know how to calculate mean, median, and mode 3.If mean = median, symmetric distribution. If Mean>Median, right skewed. If Mean<median, left skewed. 4.Percentile a.Useful for finding measures of location other than the center. b.Common are 25thand 75thc.50thpercentile is the median. 5.Calculating percentile