a) Check whether the following sample has been drawn from a Normal population.
b) Calculate 95% Confidence interval for population Variance and standard deviation.
26.7, 25.8, 24.0, 24.9, 26.4, 25.9, 24.4, 21.7, 24.1, 25.9, 27.3, 26.9, 27.3, 24.8, 23.6