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You wish to test the claim that μ < 300. A sample of 64 yielded a...

You wish to test the claim that μ < 300. A sample of 64 yielded a mean of 280. If σ is known to be 70, compute the value of the standardized test statistic, z.

A. 8.75

B. -0.29

C. 0.29

D. -2.29

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Answer #1

Standardised test statistic is given by

z= sqrt{n} (rac{x-mu}{sigma})

= v64(2800)-2.29

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