PPT-Standard Deviation Two classes took a recent quiz. There were 10 students in each class,

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. DESCRIPTION The formula for the standard deviation is EQ 221 while the formula for the weighted standard deviation is EQ 222 where w is the weight for the ith observation N is the number of nonzero weights and is the weighted mean of the observation . 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 . the Mean. &. . the. Standard Deviation. We want to. . M CLR. . the calculator to. Clear its Memory. We w. ant to. . . M CLR. . the calculator to. Clear its Memory. We want the calculator . Grouped . frequency table. . We first need to make . sure the . calculator is . CL. ea. R. . of all . previous content. . We first need to make . sure the . calculator is . CL. ea. R. . of all . previous . 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 . First center (expected value). Now - spread. 4.2 (cont.) Standard Deviation of a Discrete Random Variable. Measures how “spread out” the random variable is. Summarizing data and probability. Data. 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?. a . frequency . table. 1 person rolled a di 50 times and recorded their rolls.. Find the . Min . Max. Range. Mean . Standard Deviation. . from the calculator. . We first need to make . sure the . calculator is . 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 . © 2017 W.H. Freeman and Company. 1.1-1. When ordering vinyl replacement windows, the following variables are specified for each window. Which of these variables is . quantitative. ?. a. window style: double hung, casement, or awning. Analyze the spread of data.. 4. 3. 2. 1. 0. In addition to level 3.0 and above and beyond what was taught in class,  the student may:. · Make connection with other concepts in math. · Make connection with other content areas.. 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. Analyze the spread of data.. 4. 3. 2. 1. 0. In addition to level 3.0 and above and beyond what was taught in class,  the student may:. · Make connection with other concepts in math. · Make connection with other content areas.. 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.