Please use R code to solve and provide the R code 9. The prevalence of a disease is known to be 0.15. The sensitivity of a test for the disease is 0.98; the specificity is 0.85. a. Calculate the predictive value positive. i. 0.963 ii. 0.914 iii. 0.776 iv. 0.421 b. Calculate the predictive value negative. i. 0.996 ii. 0.963 iii. 0.914 iv. 0.869

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