I'm taking stats online which is making it even more difficult for me and I have nowhere to begin when answering this question.

1. A pharmaceutical industry claimed that their new product will lower the cholesterol level by an average of 14.5. To verify the claim, a laboratory tested the drug to a randomly selected one sample of 150 individuals for certain period and found that the new drug can reduce the cholesterol level by the by 12.4 with a standard deviation of 3.5. Assuming that the distribution is normal, follow the five steps hypothesis testing and test the validity of the claim at 95%.level.

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  1. Don't know what you are referring to with "the five steps," but here is a method.

    Z = (score-mean)/SEm

    SEm = SD/√n

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

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    posted by PsyDAG

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