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1. A sample of 81 observations is taken from a normal
population...
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1. A sample of 81 observations is taken from a normalpopulation with a standard deviation of 5. The sample meanis 40. Determine the 80% confidence interval for thepopulation mean. (Hint: Confidence Interval for aPopulation mean with population standard deviation (?)known)
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Solution Given that 40 5n 81At 80 confidence
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