A psychologist is interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of 11 . The psychologist randomly selects 50 children from this group and finds that their mean IQ score is 110 . Based on this sample, find a 95% confidence interval for the true mean IQ score for all children of this group. Then give its lower limit and upper limit

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