A. please consider the unknown population standard deviations as equal. B. repeat the question and consider the two unknown population standard deviations as unequal.

equal. The values below are taken from a sample of women and men about their retirement ages. Test at 2.5% significance level whether the mean the mean retirement age for all women is higher than the mean retirement age for all men. For women: 1, = 800, x, = 62.7 years , S, = 4.5 years For men: 12 = 1000, X2 = 62.2 years, S, =3 years