10.5.7. The following data were collected HS pa rt of a study to see whether a mouse's early upbringing has any effect on its aggressiveness later in life (82). A total of 307 mice were divided in to two groups shortly af1er birth. Each of the 167mice in the first group
was raised by its natural mother, the remaining 140 in the s1Xood group were raised
by "foster'' mice, When each mouse was three months ol d, it was put into a small cage with another mouse it had not seen before. The two were then watched for a predetermined period of time (six minutes) to see whether they would start fighting.
Set up and carry out an awropriate x2 test. Let r::t = 0.05.
Natural Mother Foster Mother
Number fighting Number not fighting
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