Summary statistics computed from two independent samples are as follows:

Summary statistics computed from two independent samples are as follows: n1 = 50, x1 = 175, s1 = 18.5, n2 = 42, x2 = 158, and s2 = 32.4. Construct a 95% confidence interval estimate for the difference between the means of two normally distributed populations, where the unknown population variances are assumed to not be equal. The upper confidence limit is 

A. 19.123. 

B. 28.212. 

C. 24.911. 

D. 5.788. 

Solution