Variance and standard deviation problems
[DOCX File]Describing and Interpreting Data
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Variance/Standard Deviation The standard deviation is the average variation of the data values from the mean of the values and is the most commonly used measure of variation. Note that the values for the standard deviation are different for a sample and a population.
[DOC File]BIO101 F’98
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Many of the questions/problems in the text are very useful for practice. Without ignoring the other questions/problems, make sure that you can work through the following: Chapter 21, Questions 12, 14, 16, 18 (answers are in the text) Chapter 22, Questions 6, 7, 8 (answers to 6 and 8 are in the text) Formula. Variance Standard deviation
[DOC File]Formula Sheet and List of Symbols, Basic Statistical Inference
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Title: Formula Sheet and List of Symbols, Basic Statistical Inference Author: Brian Stipak Last modified by: Brian Stipak Created Date: 2/1/2007 8:56:00 PM
[DOCX File]CALCULATING STANDARD DEVIATION WORKSHEET
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When the standard deviation is large, the scores are more widely spread out on average from the mean. The standard deviation is calculated to find the average distance from the mean. Practice Problem #1: Calculate the standard deviation of the following test data by …
[DOC File]1-8: A Wall Street Journal/NBC News poll asked 2013 adults ...
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a. Compute the mean, variance, and standard deviation for the car rental rates. b. A similar sample of seven Western U.S. cities showed a sample mean car rental rate of $38 per day. The variance and standard deviation were 12.3 and 3.5, respectively. Discuss any difference between the car rental rates in Eastern and Western U.S. cities.
[DOC File]FE Exam Review
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Find the sample variance of 5, 2, 6, 3. ... Use the following information for problems 7 and 8. Thermometers from a factory are designed to register C at the freezing point of water. ... If the average woman weighs 143 lbs with a standard deviation of 29 lbs, what percentage of women have a weight between 140-211 lbs? 49% b. 57% c. 53% d. ...
[DOC File]00 PSY221 title and cover page - Fayetteville State University
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a. the new standard deviation and the old standard deviation will be the same. b. the new standard deviation will be twice as large as the old standard deviation. c. the new standard deviation will half the size (twice as small) as the old standard deviation. d. not enough information to answer this question. Two samples are as follows. Sample ...
[DOC File]CALCULATING STANDARD DEVIATION WORKSHEET
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Sep 26, 2015 · Activity 1G: CALCULATING STANDARD DEVIATION. The standard deviation is used to tell how far on average any data point is from the mean. The smaller the standard deviation, he closer the scores are on average to the mean. When the standard deviation is large, the scores are more widely spread on average from the mean. The . standard deviation
[DOC File]Calculating Probability
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Mean, variance and standard deviation Binomial Distribution The binomial distribution is a useful distribution to describe the quantities such as number of males in a class of 60 people, and number of heads by tossing a coin 3 times, number of defects in a batch of 10 products, etc.
[DOC File]Variance and Standard Deviation Questions - Web Maths
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Given Σh2 = 254 307 work out the variance. Show all your working. c. Work out the standard deviation. 4. For a set of 10 numbers: Σx = 50 Σx2 = 310. For a set of 15 numbers: Σx = 86 Σx2 = 568. Find the mean and the standard deviation of the combined set of 25 numbers. 5. The number of members (m) in six scout groups was recorded.
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