Homework Answers
M1 = 20 , M2 = 15 , So ( M1-M2 ) = 20-15 = 5
Confidence interval is given by ,
Lower bound = 
= 5 - (2.145*1.34)
Lower bound = 2.1257
Upper bound = 
= 5 + (2.145*1.34)
Upper bound = 7.8743
Answer : C . UL : 7.87 ; LL : 2.13
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