## (Solution Document) Please show work. 3)A random sample of n = 81 observations has a mean x = 26.6 and a standard deviation s = 3. Find the 95% margin of error for your...

3)A random sample of n = 81 observations has a mean x = 26.6 and a standard deviation s = 3.6.

_______

(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.)

_______ observations

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