SOLUTION: A manufacturer of electronic kits has found that the mean time required to assemble circuit tester is 3 hours. with a standard deviation of 0.20 hours. in the test of effectiveness

Question 939584: A manufacturer of electronic kits has found that the mean time required to assemble circuit tester is 3 hours. with a standard deviation of 0.20 hours. in the test of effectiveness of the new booklet, 15 circuit tester require a mean of 2.90 hours to complete the job. Assuming the population of times is normally distributed, and using the 0.05 level of significance.

a) should we conclude that the new booklet is effective ?

b) known or unknown ?

with solution thank you
Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
Hi,
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Thanks
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