An estrogen blocking drug Tamoxifen used to treat breast cancers is believed to have osteoporosis as a side effect. To test this concern, cancer subjects (women with cancer) were randomly selected and given Tamoxifen and their bone density was recorded before and after the course of the treatment.

1. The treatment group is the women who received Tamoxifen.

2. There is no control group in the study.

3. This is an observational study.

4. This is a completely randomized experiment.

5. This is a matched pairs design.

Identify if the 5 statements above are true or false. Explain each of these thoroughly, thanks!