The PROMISE Software Engineering Repository, hosted by the University of Ottawa, is a collection of publicly available data sets to serve researchers in building prediction software models. A PROMISE data set on software reuse, saved in the SWREUSE file, provides information on the success or failure of reusing previously developed software for each project in a sample of 24 new software development projects. IEEE Transactions on Software Engineering, Vol. 28, 2002. Of the 24 projects, 9 were judged failures and 15 were successfully implemented.

a. Identify the experimental units for this study.

b. Describe the population from which the sample is selected.

c. Use the sample information to make an inference about the population.