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The average starting salary of a random sample of 100 high school students was found to...

  1. The average starting salary of a random sample of 100 high school students was found to be $31,840. The population standard deviation for all such individuals is known to be $9,840.
  1. (12) Ten years ago, the average starting salary was $25,000. Does the sample data support the claim that the starting salary for this group has increased? Use alpha = 0.05.
  2. (6) Describe in general Type I and Type II errors and the Power of the test.
  3. (6) Describe in the context of the problem Type I and Type II error, and the Power of the test.
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