(Refer to Figure 14.) One hour after an oxygen system was ch…

(Refer to Figure 14.) One hour after an oxygen system was charged for a leakage check, the oxygen pressure gauge read 460 psi at 63__degrees__F; 6 hours later the temperature was 51__degrees__F. (A 5 psi change is the maximum allowable in a 6-hour period.) What pressure gauge readings would be acceptable to remain within the allowable limits?

Dr. Lewis is planning on studying a species of insect called…

Dr. Lewis is planning on studying a species of insect called the Blue Death Feigning beetle. These beetles will play dead as a defense if they are attacked by a predator.  In this study she plans to present the beetle with a tone, and then grab the beetle as a predator would (without hurting them of course).  Which of the following would be a good example of a random control group that she should use in this study?