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Suppose that we want to test the hypothesis that mothers with low socioeconomic status (SES) deliver...

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Basic Math

Suppose that we want to test the hypothesis that mothers withlow socioeconomic status (SES) deliver babies whose birthweightsare different than "normal". To test this hypothesis, a list ofbirthweights from 69 consecutive, full-term, live-born deliveriesfrom the maternity ward of a hospital in a low-SES area isobtained. The mean birghweight is found to be 116 oz. Suppose thatwe know from nationwide surveys based on millions of deliveriesthat the mean birthweight in the United States is 120 oz, with astandard deviation of 23 oz. At ? = .06, can it be concluded thatthe average birthweight from this hospital is different from thenational average? (a) Find the value of the test statistic for theabove hypothesis. (b) Find the critical value. (c) Find thep-value.

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Solution Given that 116 120 23n 69aTest statistic z n 116 120 23 69    See Answer
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