before attempting to solve Formula 9.2. Also, in Formula 9.4, perform the mathematical operations in the proper sequence. First square each sample standard deviation, then divide by N 1, add the resultant values, and then find the square root of the sum.)

a. Sample 1 Sample 2

72.5

76.0 s1
14.3 s2
10.2 N1
136 N2
257 X1 X2

b. Sample 1 Sample 2

107
103 s1
14 s2
17 N1
175 N2
200