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The mean life of a sample of 10 electric light bulbs was found to be 1456 hours with standard deviation of 423 hours. A second
The mean life of a sample of 10 electric light bulbs was
found to be 1456 hours with standard deviation of 423
hours. A second sample of 17 bulbs chosen from a
different batch showed a mean life of 1280 hours with
standards deviation of 3988 hours. Is there a significant
difference between the means of the two batches. Take 5
per cent level of significance. (Given calculated value of
t-statistics at .05 level of significance is 2.06).
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