An efficiency expert came to the lab the other day.

An efficiency expert came to the lab the other day. She examined a certain extraction procedure and noted that if the staff performed the extraction in another way, they would speed up the analytical process. To demonstrate her point, she examined the production records before and after implementing her new procedure. From the 25 staff, production was shown to increase in 18 of the staff, remained the same in 3 and decreased in 4 of the staff. If one were to use the Sign Test to test the claim that there was an “significant” increase in efficiency, what would be the Critical value?
Answers:
a) 5
b) 4
c) 7
d) 6

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