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In a population, u = 100 and sx = 25. A sample of 150 people has...

  1. In a population, u = 100 and sx = 25. A sample of 150 people has a mean of 120.
    1. Using two tails and a criterion of .05, what is the critical value?

  1. Compute standard error of the mean (σX) and z-score of the sample mean. Show your work.

  1. Is the sample mean in the region of rejection and how do you know? (Hint: draw it out)

  1. Should we conclude that this sample is representative of the population? Why or why not?
Math   Statistics-And-Probability   
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