What is Log10 of the forecast for year 9?
Log10: 
Definitions:
Critical Value
A point on the scale of a test statistic beyond which we reject the null hypothesis and conclude that the observed data are unlikely under the assumed model.
Obtained Value
In statistics, the actual value measured or calculated during an experiment or study.
Null Hypothesis
A statement in hypothesis testing that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.
T Test
A statistical method that evaluates whether there is a significant difference between the averages of two distinct groups.
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