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7. The scores of a certain population on the Wechsler Intelligence Scale for Children (WISC) are
thought to be Normally distributed with mean ? and standard deviation ? = 10. A simple random
sample of 25 children from this population is taken and each is given the WISC. The mean of the
25 scores is = 104.32.
Based on these data, a 95% confidence interval for ? is
A. 104.32
Solution
C. 104.32 ± 3.92.

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  • 1. 7. The scores of a certain population on the Wechsler Intelligence Scale for Children (WISC) are thought to be Normally distributed with mean ? and standard deviation ? = 10. A simple random sample of 25 children from this population is taken and each is given the WISC. The mean of the 25 scores is = 104.32. Based on these data, a 95% confidence interval for ? is A. 104.32 Solution C. 104.32 ± 3.92.