A computer program for multiple regression has been used to fit $ \widehat $ $ y_ {i} $ = $ b_ {0} $ + $ b_ {1} $ $ \cdot $ $ X_ {1j} $ + $ b_ {2} $ $ \cdot $ $ X_ {2j} $ + $ b_ {3} $ $ \cdot $ $ X_ {3j} $ Part of the computer output includes: <image 1> Calculation of confidence interval for  b2  consists of _______$\pm $ (a student's t value) (_______)
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