(10 marks) la a study of consumption of kombucha (fermented sweet ica) and coronary heart disease (CHD) a cohort of Venice Beach, California residents The residents were studied for 10 years and then classified based on if they regularly consumed kombucha or not. Of the kombucha consumers 321 out of 1020 wiffred some form of CHD. Of the poo-kombucha convicts 367 out of 950 suffered some form of CHD. At 95%% is the proportion of CHD in the komibacha comunity lower than the proportion of CHD in the son-kombucha consumers? 2. [ 10 marks] A phase I clinical trial is run to see the effect of a dict with a drastically reduced salt content has any effect on the recovery time of the patients after heart surgery. The current standard mean time for recovery is known from a large number of records to be 2.1 months. The study enrolled 17 patients who underwent a heart valve replacement and had the patients adhere to the new very low salt content diet. The mean recovery time for the 17 patients was found to be 1.92 months with a standard deviation of 0.46 months. Based on this data and assuming a 95% confidence requirement, is there any evidence of that the low salt diet has affected the mean recovery time of the valve replacement patients