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(b) Assuming a known standard deviation of 2.00 mg, calculate the z test statistic to test the manufacturers claim. (Round your answer to 4 decimal

(b)

Assuming a known standard deviation of 2.00 mg, calculate the z test statistic to test the manufacturers claim. (Round your answer to 4 decimal places. A negative value should be indicated by a minus sign.)

Test statistic??----

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