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9 Cards in this Set
- Front
- Back
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P Value |
Probability of a given result assuming that the null hypothesis is true |
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Z Test |
Hypothesis test used when sample size is greater than 30 and normally distributed |
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T Test |
Hypothesis test used when sample size is less than 30 |
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Normal Distribution |
A normal distribution is a bell shaped frequency distribution curve. Most data values are clustered around the mean. The further a data point is from the mean, the less likely it is to occur. |
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Hypothesis test |
A hypothesis test allows you determine whether the result attained by changing a process is meaningfully different from results obtained prior the the change |
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Null hypothesis |
Assumption that a change made to a process has no effect on the results obtained |
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Hypothesis test formula |
Z = (Population Mean - Sample Mean)/Population SD Population SD = Sample SD/sqrt(Sample Size) |
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SD as Percentages |
1st - 68% 2nd - 95% 3rd - 99.7% |
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Confidence interval |
A confidence interval tells you with alpha certainty the range of the value being examined |
