7.29 Bird songs. Bird songs have been hypothesized to be a secondary sexual character signaling an individual's health status. Researchers designed an experiment in which they randomly assigned male collared flycatchers (Ficedula albicollis) to two groups. One group received an immune challenge in the form of an injection of sheep red blood cells, and the other group received a placebo injection. The researchers then recorded the changes in song rate (in strophes per minute)after the injection for the 15 males in the immune challenge group and the 12 males in the placebo group. a. Outline the design of this experiment. b. Label the birds from 1 through 27. Use software or Table A at line 131 to carry out the randomization your design requires..