If George and his wife wish to increase the chances of becoming pregnant, they should know that George's sperm can survive about how long following ejaculation?

One way to reduce the effects of the presence of the observer on the behavior of the observed is to

a. conceal the observer or use hidden camera recorders. b. take careful notes using a rating scale. c. make friends with the observed. d. record only selected details by using a behavioral assessment instrument.

Suppose a new technique is developed that can accurately and quickly measure monoamine oxidase levels in the brain. Using this technique, a scientist finds a very low level of monamine oxidase in the brain of a research participant

What will the scientist conclude about this person's current level of serotonin? a) The serotonin level is normal. b) The serotonin level is likely to be very high. c) The level of serotonin is at such low levels that it may cause death. d) The level of serotonin is not related to monoamine oxidase, so no conclusion could be reached.