Using standard deviation to find percentage
[DOC File]5
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Heights of men are normally distributed with a mean of 69.0 in. and a standard deviation of 2.8 in.; find the percentage of men who can fit through the standard doorway without bending or bumping their head. When designing an environment, one common criterion is to use a design that accommodates 95% of the population.
[DOCX File]Chem. 116 Spring 2009 Worked Lecture Problems/Examples
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4-A(iii) For the following bowling scores 116.0, 97.9, 114.2, 106.8 and 108.3, a bowler has a mean score of 108.6 and a standard deviation of 7.1. What is the 90% confidence interval for the mean? Degrees of freedom 5-1 =4, 90% confidence from student’s t table = 2.132
[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 ...
[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.
[DOC File]Word Processing - State University of New York at Oneonta
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Find the percentage of men meeting those height requirements. (The National Health Survey shows that heights of men are normally distributed with a mean of 69.0 inches and a standard deviation of 2.8 inches) Using the information given in the prior problem, what height corresponds to the 25th percentile? ...
[DOC File]Standard deviation - 物理系
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To understand standard deviation, keep in mind that variance is the average of the squared differences between data points and the mean. Variance is tabulated in units squared. Standard deviation, being the square root of that quantity, therefore measures the spread of data about the mean, measured in the same units as the data.
[DOC File]Z-Score Practice Worksheet
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A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to each of the following values: A score that is 20 points above the mean. z=2. A score that is 10 points below the mean. z=-1. A score that is 15 points above the mean z=1.5. A …
[DOC File]Exam 3 Practice Questions
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48. B First, we use a calculator to find that the sample standard deviation s = 83.55. Then. 49. A The 95% confidence interval for the population mean is. In this particular problem, we have. Using df = n – 1 = 4, we look up (in a table) that t.025 = 2.776. Then our confidence interval is. 50.
[DOC File]Percentages: The most useful statistics ever invented
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Since a percentage is simple to calculate (much simpler than, say, a standard deviation, the formula for which has 11 symbols!), you would think that it is also simple to interpret. Not so, as this chapter will now show. Small base. It is fairly common to read a claim such as “66 2/3 % …
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