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A sample of 25 seniors from a large metropolitan area school district had a mean Math...

  1. A sample of 25 seniors from a large metropolitan area school district had a mean Math SAT score of 450. Suppose we know that the standard deviation of the population of Math SAT scores for seniors in the district is 100. A 90% confidence interval for the population mean SAT score for the population of seniors is used. Which of the following would produce a confidence interval with a smaller margin of error?                                                                                  (2)
  1. Using a sample of 100 seniors
  2. Using a confidence level of 95%
  3. Using an alpha (α) of 0.01
  4. Using a sample of only 10 seniors
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