Garrison Keller claims the children of Lake Wobegon are above average. You take a simple random sample of 9 children from Lake Wobegon and measure their intelligence with a Wechsler test and find the following scores: {116, 128, 125, 119, 89, 99, 105, 116, and 118}. The mean of this sample  is 112.8. We know Wechsler scores are scaled to be normally distributed with a mean of 100 and standard deviation of 15. Is this sample mean sufficiently different from a population mean (µ) of 100 to reject the null hypothesis of “no difference?”

 

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To determine if the sample mean of 1128 from the children of Lake Wobegon is significa... View the full answer