Mean and standard deviation probability
[DOC File]Columbia University in the City of New York
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In the standard normal table, we note that an upper-tail probability of 0.15 (found by looking in the middle of the table for a probability near 0.35) corresponds to about 1.04 standard deviations above the mean, and a probability of 0.25 corresponds to about 0.67 standard deviations above the mean.
[DOC File]Eight Practice Problems -- Normal Distribution
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A mile-runner’s times for the mile are normally distributed with a mean of 4 min. 3 sec. (This would have to be expressed in decimal minutes -- 4.05 minutes), and a standard deviation of 2 seconds (0.0333333··· minutes (the three dots indicate a repeating decimal)). What is the probability that on a given run, the time will be 4 minutes or ...
[DOC File]STAT 515 --- Chapter 3: Probability
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• The sample standard deviation: • These are point estimates (single numbers). • An interval estimate (confidence interval) is an interval of numbers that is designed to contain the parameter value. • A 95% confidence interval is constructed via a formula that has 0.95 probability (over repeated samples) of containing the true parameter ...
[DOC File]RANDOM VARIABLES: probability distributions, means, …
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STANDARD DEVIATION: This is just the square root of the variance and is used more often than variance. The notation is . Example to show that and variance and standard deviation are a measure of how data vary, that is, if the data is more variable these numbers are bigger. Consider the 3,3,5,6,13 example as well as 5,5,5,6,7,8.
[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.
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