36. The rats in the previous exercise were labeled 01 to 14. Unknown to the researchers, the 5 rats labeled 01 to 05 have a genetic defect that favors cataracts. If we simply put rats 01 to 07 in the tea group, the experiment would be biased against tea. We can observe how random selection works to reduce bias by keeping track of how many of these 5 rats are assigned to the tea group. Use one of the technology procedures in Spotlight 7.1 (page 300) to carry out the random assignment of 7 rats to the tea group 25 times, keeping track of how many of rats 01 to 05 are in the tea group each time. Make a histogram of the count of rats 01 to 05 assigned to tea. What is the average number in your 25 tries? Based on your results, describe how random selection works to reduce bias.