grade | Coef. Std. Err. t P>|t| [95% Conf. Interval] hours | -1.423611 _cons | .2237227 -6.36 0.000 -1.939517 -.9077057 103.4722 4.785783 21.62 0.000 92.43619 114.5083

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.