If the population standard deviation is known and the sample size is large enough, the normal distribution should be used for better results. A t-distribution is a probability distribution similar ...

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However, there are drawbacks to normal probability and it can be difficult to determine whether or not a sample truly follows ...

The calculator shows the area in grey, and returns the probability represented by the area ... using simulated fish length data which is assumed to come from a normal distribution. Users can choose ...

Normal probability distribution is assumed in financial models; however, the returns of many securities tend to demonstrate a non-normal distribution. For example, some distributions are skewed ...

Unlike Q-Q and probability plots, P-P plots are not invariant to changes in location and scale. See CAPPP2 in the SAS/QC Sample Library For example, the data in the "Getting Started" section are ...