PPT-Standard Deviation, Z-Scores, Variance

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. 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?. . The student will be able to: . . find the . variance. of a data set.. . find the . standard deviation. of a data set.. SOL: A.9 . 2009. Variance. Variance. is the average squared deviation from the mean of a set of data. It is used to find the . TIPS FOR APLIA. Developed By: . Ethan Cooper (Lead Tutor) . John Lohman. Michael Mattocks. Aubrey Urwick. Chapter 4: . Variability. Key Terms: Don’t Forget . Notecards. Variability (p. 104). Range (p. 106). 2.4. http://. www.youtube.com/watch?v=Rn_OhPKBjB0. Why we need to learn something so we never sound like this. . Range . The simplest measure of variance is the range.. The range of a data set is the difference between the maximum and minimum data entries in the set.. 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?. . Averages and Variation. 3. Copyright © Cengage Learning. All rights reserved.. . Section. . 3.2. Measures of Variation. Focus Points. Find the range, variance, and standard deviation.. Compute the coefficient of variation from raw . Administrative Stuff:. Anna’s Office Hours. Tuesday after class: in the Co-lab. Friday 10-11am: . rm. 107. Making Sense of Overwhelming Data. “. Today companies like Google, which have grown up in an era of massively abundant data, don't have to settle for wrong models. Indeed, they don't have to settle for models at all. . 1.. Six different books will be displayed in the library window. How many different arrangements are there? . 2.. The code for a lock consists of 5 digits. The last number cannot be 0 or 1. How many different codes are possible?. Objectives:. To calculate and interpret the standard deviation of a data set. To compare the standard deviation of data sets. Warm-up: Complete Problem 1, Questions 1 – 5, on pages 490 – 491.. Use. 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 . SBS200 - Lecture . Section 001, . Spring 2017. Room . 150 Harvill Building. 9:00 . - . 9:50 . Mondays, Wednesdays & Fridays. .. Welcome. http://www.youtube.com/watch?v=oSQJP40PcGI. A . note. . on doodling. 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.. 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. 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 .