Birth weight and IQ: estimation. Infants weighing less than 1500 grams at birth are

Chapter 0, Problem 17.17

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Birth weight and IQ: estimation. Infants weighing less than 1500 grams at birth are classed as very low birth weight. Low birth weight carries many risks.One study followed 113 male infants with very low birth weight to adulthood. Atage 20, the mean IQ score for these men was x = 87.6.5 IQ scores vary Normallywith standard deviation = 15. Give a 95% confidence interval for the mean IQscore at age 20 for all very-low-birth-weight males. Use the four-step process forconfidence intervals (page 350) as a guide.17.18 Birth weight and IQ: testing. IQ tests are scaled so that the mean score in a 4

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