What is the reasoning behind the randomized block design?
What will be an ideal response?
Like stratified sampling, randomized block designs are constructed to reduce noise or variance in the data. They require you to divide the sample into relatively homogeneous subgroups or blocks (analogous to "strata" in stratified sampling). Then, the experimental design you want to apply is implemented within each block or homogeneous subgroup. The key idea is that the variability within each block is less than the variability of the entire sample. As a result, each estimate of the treatment effect within a block is more efficient than estimates across the entire sample. When you pool these more efficient estimates across blocks, you should get a more efficient estimate overall than you would without blocking.
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Depression has been linked to low activity of the neurotransmitters ________ and ________.
a.) dopamine; endorphin b.) GABA; EDTA c.) serotonin; norepinephrine d.) cortisol; MDMA
"It's too bad my car was damaged by the tree that fell on it during the hurricane, but now I can get that new car I've wanted for so long." This is an example of which coping strategy?
a. Reappraising the situation b. Learning from the experience c. Making social comparisons d. Cultivating a sense of humor