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Q2:Suppose that the mean score of a class of 28 students was 74. The 18 male students in the class had a mean score of 66. What was the mean score for the 10 female students?
I don't understand how to find this answer
Q3: Please show calculation to problem. Dullco Manufacturing claims that its akaline batteries last forty hours on average in a certain type of portable CD player. Tests on a random sample of 18 batteries showed a man battery life of 37.8 hours with a standard deviation of 5.4 hours. What is the test statistic? In a left-tailed test at a = .05 would we rejecting the claim, accepting the claim, either cause it is too close,or switch to a = .01 for a more powerful test.
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