Question: =+b. Estimate the difference between true average TBBMC for the two periods of concrete in a way that conveys information about precision and reliability. Does

=+b. Estimate the difference between true average TBBMC for the two periods of concrete in a way that conveys information about precision and reliability. Does it appear plausible that the true average TBBMCs for the two periods are identical? Why or why not?

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