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3 Cards in this Set
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- Back
- 3rd side (hint)
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What is the formula for Confidence Intervals? |
XBar +or- Z%(sigma/√n) |
Not the formula for meth... |
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When an alarm is raised a fire station cannot send a fire engine until at least 5 fire fighters arrive at the station. The call out time, X minutes, is the time between an alarm being raised and the fire engine leaving the station. The value of X was recorded on a random sample of 50 occasions. The results are summarised as: SumOfX = 286.5 , SumOf(X-XBar)^2 = 45.16 , Find the values of the Mean and SD. |
Mean is 5.73 and SD is 0.96 |
Use Sample SD formula |
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What is the formula for the Sample SD? |
√1/n-1(X-XBar)^2 |
Not a population formula. |
