9.5 Sample Sizes and the t-Distribution
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4 Terms
1
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confidence interval
an interval or range of values for a model parameter that is estimated to include the true population parameter
2
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68-95-99.7 rule
a rule that tells you how much data is contained within each standard deviation away from the mean - in a normal distribution, about 68% of the data is within 1, 95% is within 2, and 99.7% is within 3
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ME = t*n-1 (s/√n)
the equation to determine a sample size - an estimate for the margin of error and the standard deviation is needed
4
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margin of error
in a confidence interval, the extent of the interval on either side of the observed statistic value
Note 
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