Statistics and probalbility.

(a) A Biomedical researcher wanted to determine if cardio exercise regime reduces blood pressure. She recruited 240 patients from a government health clinic with blood pressure reading above 140 mmHg (defined as high blood pressure). They were subjected to one of the three exercise regimes randomly, and their blood pressure level was measured after two weeks of exercise. The finding is as follows: Blood Pressure Reading Exercise Regime TOTAL 140 mmHg 30 minutes 55 25 80 60 minutes 70 10 80 90 minutes 45 35 80 TOTAL 170 70 240 (i) At a significance level of 0.05, determine if the exercise regime have the effect in reducing the blood pressure reading. (9 marks) (ii) Explain if the findings obtained in part (i) is valid. (2 marks)