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[DOC File]Columbia University in the City of New York
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Her uncertainty about total sales of the book can be represented by a random variable with mean 30,000 and standard deviation 8,000. Find the mean and standard deviation of the total payments she will receive. Let the random variable X represent total sales of the book, and let the random variable Y represent the payments to the author. 2.
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[DOC File]Exam - TCNJ
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The standard deviation would indicate the spread by showing the variance from the mean. The smaller the standard deviation, the closer the scores would be to 85, whereas the larger the standard deviation the more varied the scores and, we can assume, the level of skill of the students. The range and standard deviation of the data set below are ...
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[DOC File]Review Chapter 5 and 6
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A simple random sample of n = 61 is drawn from a population. The sample mean is found to be = 125.5 and the sample standard deviation is found to be s = 10.5. Construct a 98% confidence interval for the population mean. (Round to two decimal places as needed.) No information is given about the value of the population standard deviation, so is ...
find percentage using standard deviation

[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 …
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[DOC File]Lesson Title - VDOE
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Using a calculator, find the standard deviation of the data set, including the new values. Which values are within 1 standard deviation of the mean? Are any data values more than 2 standard deviations from the mean? Add two more data values, one above and one below the mean, which will increase the standard deviation.
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[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.
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[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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[DOC File]CHAPTER 1
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Explain why you don’t have twice as many values within 2 standard deviations as you do within 1 standard deviation. Narrative: Men’s heights. Suppose the mean height for adult males in the U.S. is about 70 inches and the standard deviation is about 3 inches. Assume men’s heights follow a …
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Find percentage using standard deviation