(Exercises 5–12) For each description of data, identify Who and What were investigated and the population of interest.
Investments Some companies offer 401$(\mathrm{k})$ retirement plans to employees, permitting them to shift part of their before-tax salaries into investments such as mutual 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$(\mathrm{k})$ plan, sampled 30 other companies with similar plans and asked for their 401$(\mathrm{k})$ participation rates.