Exam 13: Students T Test for Single Samples

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A researcher believes that women today weigh less than in previous years. To investigate this belief, she randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs. Using a = 0.01 1 tail , the critical value of the appropriate statistic for testing H 0 is _________.

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