b. Choose the correct answer below. A. For confidence interval estimates of sigma or sigmasquared2, the requirement of a normal distribution is stricter, and the normality requirement cannot be waived for large samples. B. For confidence interval estimates of sigma or sigmasquared2, the requirement of a normal distribution is less strict. C. For confidence interval estimates of sigma or sigmasquared2, the requirement of a normal distribution is less strict, and the normality requirement cannot be waived for large samples. D. For confidence interval estimates of sigma or sigmasquared2, the requirement of a normal distribution is stricter