STAT 121 Study Guide - Midterm Guide: Squared Deviations From The Mean, Raw Score, Scatter Plot
25 Dec 2020
Department
Course
Professor
Document Summary
Compute mean from both raw data and grouped frequency tables. For grouped frequency tables: bottom of the page or. Put it in order than cross off each side till you reach middle. Apply the empirical rule to solve problems involving normally distributed data. Know the properties of the normal curve. Bell shaped and symmetric about the mean; area is greatest near the center. The mean, median, and mode are equal. The total area under the normal curve is equal to 1. The greater the standard deviation of the distribution, the greater the spread of the distribution"s graphed normal curve. Z-score : represents the distance a raw score is from the mean of the distribution. Negative z-score indicates associated raw score is below the mean. Positive z-score associated with raw score above the mean. Ex: raw score of 5 is located exactly 0. 45 of one standard deviation above the mean. Use z-scores to compare observations from different populations.
