(Exercises 13-20) For each description of data, identify Who and What were investigated and the Population of old interest. nvestments Some companies offer 401(k) retirement plans to employees, permitting them to shift part of their before-tax salaries into investments such as mutual 16. funds. Employers typically match 50% of the employees' contribution up to about 6% of salary. One company, concerned with what it believed was a low employee participation rate in its 401 (k) plan, sampled 30 other companies with similar plans and asked for their 401(k) participation rates