PPT-Lesson: Standard Deviation

Obj The student will be able to 1 Calculate standard deviation 2 Calculate mean deviation HWK Worksheet Vocab 1 standard deviation a measure of how spread out the numbers are. ariance The ariance of a set of values which we denote by i de64257ned as where is the mean stands for each data value in turn and is the frequency with which data alue o ccurs Note that An alternative yet equivalent formula which is often easier to We will do this by pulling together everybodys data then calculating the average standard deviation and relative stand ard deviation You can then compare your data with the average of everybodys data The average result is calculated by summing t ariance The ariance of a set of values which we denote by i de64257ned as where is the mean stands for each data value in turn and is the frequency with which data alue o ccurs Note that An alternative yet equivalent formula which is often easier to Let’s start with an example. I divided the class into 2 teams, A and B. Coincidentally, the quiz average for team A is the same as team B, 81.5. So we expect a graph of their scores to be about the same, right?. Standard Deviation. . summarizes . the amount . each value . deviates. from . the mean. . . SD. . tells us how . spread out . the data items are in our data set.. If data . is close together, . standard will . Standard Deviation and a Bell Shaped Curve. Bozeman Biology Video on Standard Deviation. Standard deviation measures the spread or the variation in the data. 68% of the individuals are within 1 standard deviation . Standard Deviation. &. The Bell Curve. Standard Deviation. 1st find the . variance. for a set of data. Variance is the average squared deviation from the mean of a set of data. Computing the Variance . Kevin McLeod & Chris Horton. OCE, Region 12 Houston. 1. Introduction. Brief discussion of history and scope. Review of compliance documents. Investigation process. 2. Clean Air Act. 1977 Clean Air Act. Annette Maxwell and Erica Solis. Office of Compliance and Enforcement . May 5, 2015. Brief discussion of history and scope. Review of compliance documents. Investigation process. Introduction. 1977 Clean Air Act. Unusual Values. . . Ruisheng. Zhao. OER – . www.helpyourmath.com. . What is the MEAN?. How do we find it?. The mean is the numerical average of the data set, and we use the mean to describe the data set with a single value that represents the center of the data. Many statistical analyses use the mean as a standard measure of the center of the distribution of the data.. Algebra 1B Lesson 42. Instructional material 2. Standard Deviation. Standard Deviation . is a number that tells us how a value in the data set differs from the mean. It also tells us how spread out the numbers are. The bigger the standard deviation, the more widespread the data is.. Standard Deviation. Standard Deviation – measure . how spread out the data is from the mean. Lower standard deviation:. Data is . closer to the mean. Greater likelihood that the independent variable is causing the changes in the dependent variable. Since the averages are the same, can we assume that the students in both classes all did pretty much the same on the exam?. The answer is… No.. The average (mean) does not tell us anything about the distribution or variation in the grades.. Find the standard deviation and variance of a set of values. . Apply standard deviation and variance. . Vocabulary. Standard deviation: A measure of how far the numbers in a data set deviate from the mean. Represented by the Greek letter Sigma .