Mainly need help with C, D, & E please!

A company with 275 workers would like to apply the Strain Index. The company can lower all its jobs to an SI score of 13.5 or less. a. Construct a contingency table based on Table 4 and a SI cutpoint of $ 13.5 b. Determine the sensitivity, specificity, PPV, and NPV, based on (a) C. In your opinion, are the numbers from (b) acceptable? Why or why not? d. Using the incident rates from Table 4, and the data from the Table below, how many injuries can the company expect among its 275 employees during the next year, if all jobs are reduced to a score of 13.5 or less? State all your assumptions. e. Using the same assumptions, how many injuries could the company expect if they reduce the job scores to s 5? Table: Summary of Current SI Measured Exposures for N=275 workers Current SI Score Number of Range (SI) Workers (N) SI S 5.0 17 5.0 13.5 136