A random sample of 500 18-year-old adults who were bullied at least once a week at age 13 shows that 15% of them now suffer from depression while this rate is 7% in a random sample of 800 18-year-old adults who have never been bullied at age 13. Based on these two independent samples, can we think that the rate of depression among victims of bullying at age 13 is higher than that among those who have not been bullied ? Use a 2% threshold