Statistics Solutions

[Steps Shown] The NAEP (National Assessment of Educational Progress) includes a short test of quantitative skills, covering basic arithmetic and the ability

Question: The NAEP (National Assessment of Educational Progress) includes a short test of quantitative skills, covering basic arithmetic and the ability to apply it. Suppose a random sample of 60 young adult men are taken from a large population. (Assume σ = 60)

  1. Describe the shape of the sampling distribution of \[\bar{x}\] . Justify your answer. (1prs)
  2. If the mean of the sample is 265, what is a 90% confidence interval? (2pts)
  3. If a 95% confidence interval is 256.82 to 287.18, what is the mean of the sample? (2pts)
  4. What does 95% confidence mean? (2pts)

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