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Earn +20 ptsQ: Is a higher or lower root mean squared error better?
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Continue Learning about Statistics
Is it better to have a high or low mean absolute deviation?
Lower
Reduce type 1 error?
Accept lower p-values (meaning lower in magnitude; values tending toward zero).--And don't forget that by reducing the probability of getting a type I error, you increase the probability of getting a type II error (inverse relationship).
Can the median ever be higher than the average?
Yes. It can be higher or lower
What is the symbol that denotes population variance?
It's a lower-case Greek sigma followed by a superscript 2, in other words, "sigma-squared".
What and who determines the alpha level in statistics?
Before conducting a significance test, the statistician will choose an alpha level. Depending upon the severity of having type I or type II error, the statistician will make the alpha level higher or lower. Generally in courts, the alpha level is .05. The other common alpha levels for significance tests are .10 and .01.
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