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need help with part c

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5.6
Suppose that from a sample of 63 observations, the least squares estimat
corresponding estimated covariance matrix are given by
b1
3 -2 1
b2
3
cov(b) =
-2
4 0
b3
0
3
Test each of the following hypotheses and state the conclusion:
(a) B2 = 0
(b) BI + 2B2 = 5
(c) BI - B2 + B3 = 4

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