posted Feb 19, 2010, 7:59 AM by Prof Kiernan
| parameter |
Conditions/given | Confidence Interval
| test statistic | Key words | Proportion | nP > 5 & nQ < 5
given: population proportion (P) sample proportion (p = x/n) q=1-p & Q=1-P | |
| Proportion
Percent
You are not given a standard deviation | Mean | population data known
OR n > 30 GIVEN: σ (population standard deviation) population mean (μ) _
sample mean: X sample size = n | | | You know what the population standard deviation is. |
Mean | population data NOT known
and n < 30 GIVEN: s (sample standard deviation) population mean (μ) _
sample mean: X sample size = n | | | Given sample info |
Standard deviation OR variance(σ²) |
Population normally distributed GIVEN: σ (population standard deviation) sample size = n
s (sample standard deviation) | |
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You're working with a hypothesis about the standard deviation of a sample |
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