A weak instrument is an instrumental variable:
A. whose distribution is non-normal.
B. that suffers from heteroscedasticity.
C. whose partial correlation with the outcome is small.
D. whose partial correlation with the (endogenous) treatment variable is small.
Answer: D
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Humans suffer from dementia (similar to Alzheimer's disease) if they eat flour made from cycad seeds because:
A. The seeds have high levels of manganese that is a cause of dementia. B. The seeds contain hallucinogenic drugs similar to LSD that causes dementia. C. The seeds have enzymes that break down brain tissue causing dementia. D. The seeds contain the amino acid BMAA that causes dementia. E. The seeds have enzymes that inhibit absorption of nutrients that are essential for the transmission of nervous impulses in brain cells.
After the guanine, what is the next nucleotide that will be added to this growing strand of RNA?
1.adenine
2.cytosine
3.guanine
4.uracil
The molecular weight of an intermediate filament is:
a. 45 kDa b. 42 kDa c. 66 kDa d. 55 kDa e. None of the above
McClintock's transposable genetic element hypothesis was that the unstable mutant phenotype resulted when a ________ created a mutation by its insertion into the ________ allele and led to reversion when the expression of ________ led to its
removal. Fill in the blank(s) with correct word