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 of12

.The psychologist randomly selects90

children from this group and finds that their mean IQ score is108

.Based on this sample, find a90

%

confidence interval for the true mean IQ score for all children of this group. Then give its lower limit and upper limit.

Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.