1. Two rival manufacturers of penlight batteries claimed that their product lasts longer than the other. Thirty samples of Brand A and thirty-four of Brand B were tested. The following are the lengths of lives of such batteries recorded in hours. Use . Brand A
38 41 42 36 39 41 43 35 36 38 42 39 40 43 44
35 40 39 37 40 42 44 38 37 41 40 38 42 45 41

Brand B
38 40 41 43 39 41 40 43 39 38 40 43 44 39 40 41 42
39 40 45 40 38 42 41 40 36 37 41 42 40 36 38 41 40
solution:
H0:
Ha:
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Decision:
Conclusion