An experiment was conducted to compare the effectiveness of 2 programs in training assemblers of a piece of electronic equipment. Ten persons were randomly assigned to each of the training program. After completion of the training, each person was required to assemble a piece of the equipment, and the length of time required to complete the assembly was recorded. A test of hypothesis will be conducted to determine if the data provide evidence to indicate a difference in mean assembly times for people trained by the 2 programs. What are the critical value(s) that will be used in the conduct of the above test of hypotheses a)-1.960, 1.960  b)-1.734, +1.734  c)-1.645, 1.645 d)-2.101, 2.101

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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An experiment was conducted to compare the effectiveness of 2 programs in training assemblers of a piece of electronic equipment. Ten persons were randomly assigned to each of the training program. After completion of the training, each person was required to assemble a piece of the equipment, and the length of time required to complete the assembly was recorded. A test of hypothesis will be conducted to determine if the data provide evidence to indicate a difference in mean assembly times for people trained by the 2 programs.

What are the critical value(s) that will be used in the conduct of the above test of hypotheses

a)-1.960, 1.960 
b)-1.734, +1.734 
c)-1.645, 1.645
d)-2.101, 2.101
 
 I know option A and D are wrong but  I cant figure out the right one. I need help in solving this MCQ and getting the right answer
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