If you are a good business man then they don't.
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Numbers are powerful. This is one of the reasons why statistics can be such persuasive pieces of evidence. We too often accept them, without ever questioning their veracity or appropriateness.
This is when you reject a null hypothesis even though it is actually true...Example:1. A man is on trial for murder, he is actually INNOCENT, but found GUILTY - That is a Type I error2. A man is on trial for murder he is actually GUILTY, but found INNOCENT - That is a Type II error
An outlier can increase or decrease the mean and median It usually doesn't affect the mode
No. Outliers are part of the data and do not affect them. They will, however, affect statistics based on the data and inferences based on the data.
extreme values don't affect the mode