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Samples of two types of electric light bulbs were tested for length of life and following...

Samples of two types of electric light bulbs were tested for length of life and following data were obtained:
Type 1 Type 2
Sample Size 8 7
Sample means 1234 hrs 1036 hrs
Sample S.D’s 36 40
Is there difference in the means sufficient to warrant that type 1 is superior to type 2 regarding length of life? Find the range and test at 95% interval estimation.

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