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The attached file contains monthly and annual long term precipitation averages in Estonian meteorological stations. ### Instructions

## Exercise 4150. Points 2, theme: Gaussian Distribution |
Open exercise |

- Calculate the mean annual amont of precipitation in Estonia and the 99% confidence limits of the mean.
- Is the application of statistical methods that are presuming normal distribution justified for this sample? Why you think so?

Data : SADEMED.xls

It is easy to calculate sample statistics using SDC. Select Univariate sample and copy the data column to the input cell. The SDC removes lines beginning with a character (column names) automatically. Decimal separator can be either point or comma. Press *Calculate* or *Enter*.

The use of normality assuming methods is justified if the variable should theoretically have normal distribution of values and if the sample difference from normal distribution is not proved. A common method for checking normality is the Kolmogorov-Smirnov test.

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