Convert percentage to standard deviation
[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 % …
[DOC File]Z-Score Practice Worksheet
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How many standard deviations is that? 3.75. Convert Einstein’s IQ score to a z score. (160 – 100)/16 = 3.75. If we consider “usual IQ scores to be those that convert z scores between -2 and 2, is Einstein’s IQ usual or unusual? Unusual. Women’s heights have a mean of 63.6 in. and a standard deviation …
[DOC File]Guide to calculating, interpreting and using effect size
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The ‘standard deviation’ is a measure of the spread of a set of values. Here it refers to the standard deviation of the population from which the different treatment groups were taken. In practice, however, this is almost never known, so it must be estimated either from the standard deviation of the control group, or from a ‘pooled ...
[DOC File]6A: Characterizing a Data Distribution
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1 standard deviation of the mean. * About 95.4% of the data in a normally. distributed data set will fall within. 2 standard deviations of the mean. * About 99.7% of the data in a normally. distributed data set will fall within. 3 standard deviations of the mean. Example: The SAT is scored so that its mean is 500 and its standard deviation is 100.
[DOC File]3-12
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Jul 02, 2010 · First we need the mean and standard deviation. Learn to use your calculator or Excel to get these values. You should get x(bar) = 0.148 and s = 0.034. Since we have 6 values, the degrees of freedom is N – 1 = 6 – 1 = 5. We get the values of t from Table 4-2. For a 90% confidence level, t = 2.015. For 99% t = 4.604.
[DOC File]Solutions to Z-score Worksheet
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1. In the year 2000, there were 125 major new automobile types available. If you look at the miles per gallon (MPG) for these vehicles, the distributions are roughly normal. The means and standard deviations are given by: Mean Standard Deviation City MPG 22.37 4.77 Highway MPG 29.09 5.46 a.
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