In principle, why are t-statistics and critical values not as useful in the practical construction of confidence intervals in most applications?
A. In large samples (i.e., large degrees of freedom) the t-distribution and standard normal distribution are very similar.
B. Their use is only valid in small samples.
C. Their use is only valid in large samples.
D. They are not often found in most software applications.
Answer: A
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Diazotrophs maximize nitrogenase activity by
A) closely coupling N2 fixation with high rates of photosynthesis. B) fixing N2 at times when oxygen is absent or in low concentrations. C) producing specialized structures to protect nitrogenase from oxygen. D) producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen.
The genotype is the physical appearance of the organism
1.True 2.False
The only completely effective method of birth control is ________
Fill in the blank(s) with correct word
Why is there very little physical evidence of life from rocks of the Archaean eon?
a. Those rocks have been deeply buried in most parts of the world. b. Those rocks occupy inaccessible areas of mountainous regions. c. Those rocks have been greatly eroded in most parts of the world. d. Those rocks occupy the polar regions and are thus covered by glaciers. e. Those rocks have been deposited in oceanic trenches deep in the oceans.