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An experiment was conducted at the University of California-Berkeley to study the effect of psychological environment on the anatomy of the brain. A group of 19 rats was randomly divided into two groups. Twelve animals in the treatment group lived together in a large cage furnished with playthings that were changed daily; animals in the control group lived in isolation with no toys. After a month, the experimental animals were killed and dissected. Table E2.19 gives the cortex weights (the thinking part of the brain) in milligrams. Calculate separately for each group the mean x, variance s2, and standard deviation s of the cortex weight.
TABLE E2.19
Treatment
Control
707 696
669
740 712
650
745 708
651
652 749
627
649 690
656
676
642
699
698
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