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A researcher claims that adult German Shepherd male dogs fed a special diet have an average...

A researcher claims that adult German Shepherd male dogs fed a special diet have an average weight of 85 pounds. A random sample of 12 such dogs shows an average weight of 83.2 pounds with a standard deviation of 2.5 pounds

(a) Test an appropriate hypotheses. use a significant level of 0.05

(b) Find the 95% confident interval for the true mean weight

Math   Statistics-And-Probability   
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