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3)A random sample of n = 81 observations has a mean x = 26.6 and a standard deviation s = 3.6.
Find the 95% margin of error for your estimate. (Round your answer to four decimal places.)
(b) Find a 90% confidence interval for ?. (Round your answers to three decimal places.)
_____ to _____
(c) Find a 90% lower confidence bound for the population mean ?. (Round your answer to two decimal places.)
How many observations do you need to estimate ? to within 0.4, with probability equal to 0.95? (Round your answer up to the nearest whole number.)
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