1. Form linear regression model for predicting the long term mean precipitation amount in the mean precipitation amount using geographical longitude (the east-west trend). Write the model formula to the answer.
2. What is the expected precipitation amount in Tartu according to this model? The actual amount in Tartu is 49 mm.
3. Which amount of variability is source data is explained by this model?

The proportion of the variance of the dependent variable that is predictable by the independent variables in the model (the coefficient of determination -- R²) is asked here. R² is available from the results of the SDC Non-spatial regression and form results of Statistica.

The longitude of Tartu can be found from the attached file.