In a least-squares regression model, the residuals are assumed to be random. The following data represent the

Question:

In a least-squares regression model, the residuals are assumed to be random. The following data represent the life expectancy of a male born in the given year.

The least-squares regression equation, treating year as the independent variable, is ŷ = 0.2056x - 337.1973. The residuals from left to right are

(a) Denote residuals above zero with an A and those below zero with a B to form a sequence.
(b) Test the assumption that the residuals are random at the α = 0.05 level of significance.

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