What does 1 standard deviation mean
[DOC File]Standard Deviation/Standard Score Correspondence
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Standard Deviation/Standard/Scaled Score Correspondence Standard Deviation (SD) Standard Score Scaled Score 2 SD above mean 130 or above 16 or above 1 SD above mean Between 115 and 130 Between 13 and 16 Within 1 SD of mean Between 85 and 115 Between 7 and 13 1 SD below mean Between 70 and 85 Between 4 and 7 1.5 SD below mean 77.5 5.5 2 SD below ...
[DOC File]Chapter 12-13 Study Guide:
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To investigate, 100 samples of size 90 were selected from a normal population with a mean of 299.8 and a standard deviation of 9.1 and the percentage that were within 1 SD of the mean was recorded. Use the results from the simulation below to discuss if it is possible that the population is approximately normally distributed.
[DOC File]Sample Test Questions -- Test 1
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20. What is the biggest advantage of the standard deviation over the variance? a) The standard deviation is always smaller than the variance. b) The standard deviation is calculated with the median instead of the mean. c) The standard deviation is better for describing skewed distributions. d) The standard deviation is in the same units as the ...
[DOC File]Numerical Measures of Central Tendency
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Deviation from Mean: For each x-value, its deviation from the mean is: Example (Heights of sample of plants): Data: 1, 1, 1, 4, 7, 7, 7. Deviations: Squared Deviations: A common measure of spread is based on the squared deviations. Sample variance: The “average” squared deviation (using n-1 as the divisor) Definitional Formula: s2 =
[DOC File]Mean— A mathematical average of a group of numbers
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Standard deviation In essence, it represents the average distance from the average, which means that the score from one standard deviation below the mean …
[DOC File]AP Stats Reading Guide - WordPress at LPS
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that a data value is 2 standard deviations about the mean. Data values below the mean have negative z-scores, so a z-score of – 1.6. means that the data value was 1.6 standard deviations below the mean. Of course, regardless of the direction, the farther a data value is from the. mean, the more unusual it is.
[DOC File]Eight Practice Problems -- Normal Distribution
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1. Replacement times for CD players are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years (data from Consumer Reports). What is the probability that a randomly-selected CD player will have to be replaced in 8 years or less? 2.
[DOC File]Skew And Standard Deviation: - Highline College
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Standard Deviation Is Like An Average Of The Deviation: When we calculate the standard deviation, it is a way to get “an average deviation”. In this way, we then have a “typical” number we can use in discussions about the spread of the data. In our first step when calculating the standard deviation, we take our mean (typical value of ...
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