Part B 1. Breast cancer recurrence. Download "breast cancer recurrence.csv". The data contain follow- up information on 4901 breast cancer patients. The second variable "recurrent" indicates recurrent cancer. The value "1" means that cancer recurred. The recurrence rate of the 4901 patients was 23.4%. Use Stata to perform the following calculations: (a) Take the first 10 observations and calculate the recurrence rate and the 95% confidence interval. Choose "Wald" when selecting the confidence interval type. Or use the command: ci proportions recurrent in 1/10, wald Use the proportion and the standard error from the output to manually calculate 95% confi- dence interval based on the formula p+ 1.96 x SE. What happens to the lower endpoint of the confidence interval from Stata? (b) Take the first 100 observations and calculate the recurrence rate and the 95% confidence interval. (c) Take the first 2000 observation and calculate the recurrence rate and the 95% confidence internal