A random sample of n measurements was selected from a population with unknown mean and standard deviation 20 for each of

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answerhappygod
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A random sample of n measurements was selected from a population with unknown mean and standard deviation 20 for each of

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A random sample of n measurements was selected from a populationwith unknown mean and standard deviation 20 for each of thesituations in parts a through d. Calculate a 90 ​% confidenceinterval for for each of these situations.
n=70 x=28
n=250 x=120
n=100 x=14
n=100 x=4.89
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