An unbiased estimator achieves what sort of property?
A. It will always have an equal number of positive and negative errors.
B. Its mean is equal to the population parameter it is used to estimate.
C. Its loss function is the squared loss function.
D. Its variance is the lowest of all possible estimators.
Answer: B
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Parthenogenesis ____
a. is a form of sexual reproduction b. involves the growth and development of a sperm cell without fertilization c. involves the growth and development of an egg without fertilization d. occurs through budding e. always produces haploid offspring
If a small region of a chromosome containing a non-essential gene is completely deleted, and an organism has two identical chromosomes with this deletion, then the organism
A) has no alleles of that gene. B) is dead. C) has more heterochromatin. D) has recessive alleles of those genes. E) will exhibit pseudodominance.
What is the major defense mechanism employed against virus infections?
A. Autoimmunity B. Allergies C. Antibody-mediated Destruction D. Phagocytosis E. Cell-mediated Immunity
Filtration methods, followed by growth of the bacteria trapped on the filters in growth media, are used to count bacteria present in very low concentrations, such as in lakes and streams
Indicate whether the statement is true or false