Generally speaking a consequence of using an instrumental variable approach with a weak instrument will be:
A. high (in absolute magnitude) coefficient estimates.
B. imprecise coefficient estimates (e.g., large standard errors).
C. multicollinearity.
D. low coefficient estimates.
Answer: B
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The rocky shore zone that has the greatest diversity
of life is the a. upper littoral. b. midlittoral. c. lower littoral. d. intertidal. e. neritic.
In Drosophila, there is an autosomal gene that helps control the normal embryological development of larval flies. The normal allele is "bcd+" and the mutated version which creates an embryo with an abnormal body plan called bicoid is "bcd". If a mother possesses just one copy of the bcd+ gene, her offspring will develop normally regardless of the offsprings' genotype. Two flies who are both heterozygous for this gene are mated. What would be the expected phenotype(s) of their offspring in terms of development?
a) 3/4 of the offspring will have the normal body plan and 1/4 will be biocid. b) All of the offspring will develop the normal body plan. c) All of the offspring will be bicoid. d) 3/4 of the offspring will be bicoid and 1/4 will have the normal body plan.
The wobble effect pertains to the matching of
a. codons with anticodons. b. codons with exons. c. exons with introns. d. template DNA with messenger RNA. e. messenger RNA with ribosomal RNA
Curtis's contention that if the last blue whale
were to choke on the last panda bear and it still would not be the end of the world was his way of a. stressing the improper attitude of some environmental activists and to encourage the drilling for oil in Alaska. b. stressing the importance of some bacteria to the biosphere. c. encouraging the study of endangered species. d. shocking an audience into the study of conservation biology. e. doing none of these