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The scores of a certain population on the Wechsler Intelligence Scale for Children (WISC) are thought to be Normally distributed with mean . A simple

The scores of a certain population on the Wechsler Intelligence Scale for Children (WISC) are thought to be Normally distributed with mean . 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 anda standard deviations= 10. Suppose a histogram of the 25 WISC scores is the following. Based on this histogram, we would conclude that the 95% confidence interval given in the previous question is
actually a 99% confidence interval.
actually a 90% confidence interval.
not very reliable.

very reliable.

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