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When all the data points are the same.

Q: When will the unexplained variation or error sum of squares be equal to 0?

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There is a calculation error.

The mean sum of squares due to error: this is the sum of the squares of the differences between the observed values and the predicted values divided by the number of observations.

Yes

You do not add the percentage error but the actual error.

No it is not. At least, not sensibly.

Related questions

There is a calculation error.

The mean sum of squares due to error: this is the sum of the squares of the differences between the observed values and the predicted values divided by the number of observations.

An ANOVA is an analysis of the variation present in an experiment. It is a test of the hypothesis that the variation in an experiment is no greater than that due to normal variation of individuals' characteristics and error in their measurement.

Mutations

Variation in single celled organisms occurs only when there is a copying error (mutation). The main function of sex is to produce limited variation.

error

Yes

His position is listed as P (Pitcher), but he was a SS (Shortstop). Beckett Price Guide states that there is a "corrected" variation of this card, but I have not ever seen one. Most error and variation collectors agree that it does not exist.

You do not add the percentage error but the actual error.

dynamic error is caused by time variation in the measured quantity

No, it is not true. Probability can be used to describe some properties of the variation but not all.

No it is not. At least, not sensibly.