statistics

You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 5 and a population standard deviation 1 and a sample size of 4. Machine 2 has a sample mean of 8 and a population standard deviation of 2 with a sample size of 4. With an alpha of .05 can we claim that there is a difference between the output of the two machines. Which of the following statements are true?

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  1. none

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    posted by de
  2. 7 A company has three machines A, B and C which all produce the same two parts, X and
    Y. of all the parts produced, machine A produces 60%, machine B produces 30%, and
    machine C produces the rest. 40% of the parts made by machine A are part X, 50% of the
    parts made by machine B are part X, and 70% of the parts made by machine C are part X.
    A part produced by this company is randomly sampled and is determined to be an X part.
    With the knowledge that it is an X part, find the probabilities that the part came from
    machine A, B or C.

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    posted by Tofik

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