b)Find the student's t for the following variable value in a sample of eight:-−4,−2,−2, 0, 2, 2, 3, 3 taking the mean of the universe to be zero.
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Two types of batteries are tested for their length of life and the following data are obtained: No. of samples Mean life (hrs.) Sample Variance 9 600 121 8 640 Is there a significant difference in the two means? (t for 15 df at 5% level= 2.131) Type A Type B 144
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