The following 16 numbers came from normal random number generator on a computer:
a. What would you guess the mean and variance (μ and σ2) of the generating normal distribution were?
b. Give 90%, 95%, and 99% confidence intervals for μ and σ2.
c. Give 90%, 95%, and 99% confidence intervals for σ.
d. How much larger a sample do you think you would need to halve the length of the confidence interval for μ?
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