a random sample size of n is drawn from a population with me

a random sample size of n is drawn from a population with mean and standard deviation. the mean is 45 and standard deviation is 5.8. Calculate a 95% confidence interval for the mean using the sample size a. n=30 b. n=60 and c, n=90

Solution

for n=30 , 95% CI (42.95, 47.05)

for n=60 , 95% CI (43.579, 46.421)

for n=90 , 95% CI (43.848, 46.152)