Question: how to calculate 95 confidence interval range?
Answer: A 95% confidence interval for the unknown mean is ((101.82 - (1.96*0.49)), (101.82 + (1.96*0.49))) = (101.82 - 0.96, 101.82 + 0.96) = (100.86, 102.78). An increase in sample size will decrease the length of the confidence interval without reducing the level of confidence.