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A random sample of 90 observations produced a mean x=25.4 and a standard deviation s=2.8. a. Find a95% confidence interval for. b. Find a90% confidence

A random sample of 90 observations produced a mean x=25.4 and a standard deviation s=2.8.

a. Find a95% confidence interval for.

b. Find a90% confidence interval for.

c. Find a99% confidence interval for.

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