Sample standard deviation formula

    • [DOCX File]Describing and Interpreting Data

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      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.

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    • Chapter 10

      The average “moviegoer” sees 8.5 movies a year with a standard deviation of 3.2 movies. A large university claims that the average number of movies that their students see a year is different than the national average. A sample of 40 moviegoers from this university revealed that the average number of movies seen per person was 9.4.

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    • [DOC File]Counting Rule for Combinations

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      Pooled Sample Standard Deviation (Assumptions that σ1 and σ2 are equal and populations are approximately normal) & Test Statistic for Comparison of Independent Samples Chi-Square Goodness of Fit Test Statistic. Chi-Square Test for Independence Test Statistic.

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    • [DOC File]How to Calculate Median, Mode, Mean, Variance, and ...

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      Question 3, Variable A. How to Calculate Median, Mode, Range, Mean, Variance, and Standard Deviation. PART 1: Median, Mode, Range and Variance. We will use this sample of …

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    • [DOC File]Standard deviation - 物理系

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      In most cases, the standard deviation is estimated by examining a random sample taken from the population. The most common measure used is the sample standard deviation, which is defined by. where is the sample and is the mean of the sample. The denominator N − 1 is the number of degrees of freedom in the vector .

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    • [DOC File]How to calculate variance and standard deviation

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      We define the deviation of a single score as its distance from the mean: Variance. is symbolized by ( 2. Standard Deviation. is (. N is the number of scores. However, when the data of a sample are used to estimate the variance of the population from which the sample was drawn, the population variance estimate is computed instead:

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    • [DOCX File]AP BIOLOGY--LAWNDALE HS

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      1. The formula for the standard deviation, S(SD), is on the right: Identify what each of the following parts of the formula mean by explaining it in words. (a) n (b) x (c) ∑ (d) A name for the quantity n –1 is . 2. Consider the two figures. Each shows a distribution of data with a mean, x, of 5. Which has a bigger standard deviation and why ...

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    • [DOC File]Computation Formula for s:

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      Find the range, sample mean, sample standard deviation and sample variance. 5) A random sample of six credit card accounts gave the following information about the payment due on each card: $53.18 $71.12 $115.10 $27.30 $36.19 $66.48. a) Find the range, sample mean, sample standard deviation, and sample variance.

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    • [DOC File]Standard Error

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      Organized by Yue Yin. Nov. 15, 2001. Since many standard error calculations involve Standard Deviation (SD), the following two formulas are the calculations of ...

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    • [DOCX File]Calculating the Standard Deviation - Anne Gloag's Math Page

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      The procedure to calculate the standard deviation depends on whether the numbers are the entire population or are data from a sample. The calculations are similar, but not identical. Therefore the symbol used to represent the standard deviation depends on whether it is calculated from a population or a sample. The lower case letter s

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