The following data were collected as part of a study to see whether a mouse€™s early upbringing has any effect on its aggressiveness later in life (84). A total of 307 mice were divided into two groups shortly after birth. Each of the 167 mice in the first group was raised by its natural mother; the remaining 140 in the second group were raised by €œfoster€ mice. When each mouse was three months old, 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 appropriate χ2 test. Let α =0.05.

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Natural Mother 27 167 Foster Mother 47 140 Number fighting Number not fighting