A group of researchers are interested in the following studies. State the null hypothesis for each study: (8marks)a.The effect of birth weight on childhood obesity b.Testing the effectiveness of a new medication on treatment of migraine c.Researching if productivity of HIM coders increases with their age d.Studying the rate of prostate cancer in 3 ethnicities: caucasians, african-americans, and hispanics, to determine which ethnicity has the highest risk of developing prostate cancer