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Q.6. (a) A random sample is drawn from a population with a known standard deviation of...

Q.6. (a) A random sample is drawn from a population with a known standard deviation of 2.0. Find the standard error (SE) of the sample mean if the sample size is (i) 16, (ii) 36, (iii) 81.
(b) If the size of sample is 36 and the standard error of the mean is 2, what should be the size of the sample if the standard error is reduced to 1.2?

solve the above problem step by step in proper format

Math   Statistics-And-Probability   
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