An experiment was conducted among 100 mice in which half of them were put in treatment and the other half in a control g

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An experiment was conducted among 100 mice in which half of them were put in
treatment and the other half in a control group. The cortex weighs for the treatment
group averaged 685 mg with a standard deviation of 30 mg. while the cortex weighs for
the control group was 650 mg with a standard deviation mg 62 mg. If cortex weighs are
known to follow a normal distribution, determine the 90% confidence interval for the
difference between the means of the treatment and control groups.