Which of the following is false?

Question

1.The graduation rate in a city and the rate of unemployment in a city is a positive correlation
2.The cost to mail and envelope and the weight of the envelop is a positive correlation
3.A child’s age and a child’s shoe size is a positive correlation
4. Amount of exercise and percent of body fat is a negative correlation

Answer 1

3. A child’s age and a child’s shoe size is a positive correlation