(b) Families were selected at random from a certain population in which the parents had been married for at least 10 years but less than 15 years. The data was tabled by two attributes in the following manner. Number of Children 0 sum 1 > 1 12000 6 15 31 52 sum 26 67 194 287 Test, at the 1% significance level, whether the attributes - family income and number of children - are independent. [10] [Total 20]