12. Basic Computation: Confidence Interval A random sample of size 81 has sample mean 20 and sample standard deviation 3
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12. Basic Computation: Confidence Interval A random sample of size 81 has sample mean 20 and sample standard deviation 3
12. Basic Computation: Confidence Interval A random sample of size 81 has sample mean 20 and sample standard deviation 3. (a) Check Requirements Is it appropriate to use a Student's t distribution to compute a confidence interval for the population mean je? Explain. (b) Find a 95% confidence interval for u. (c) Interpretation Explain the meaning of the confidence interval you computed.
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