Q: The birthweight of babies is normally distribution with a mean of 3.8 kg. A researcher suspects that the weight of babies from mothers who smoked a lot during pregnancy will be lower than the population mean. To examine this, he takes a random sample of 26 babies from mothers who smoked a lot. The mean birthweight in this group was 3.48 kg with a standard deviation of .80 kg. (biased estimator of SIGMA**2). He takes as H(0): MU >= 3.80 kg and as H(1): MU

 

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