μ and [img=18x22]17de81fccbbd283.png[/img] are the two parameters for a normal distribution. In which situation the curve of probability density function of a normal distribution will become narrow?
A: When μ becomes larger.
B: When μ becomes smaller.
C: When σ becomes larger.
D: When σ becomes smaller.
E: When μ and σ both become larger.
A: When μ becomes larger.
B: When μ becomes smaller.
C: When σ becomes larger.
D: When σ becomes smaller.
E: When μ and σ both become larger.
D
举一反三
- If n samples are extracted from any population with mean value [img=11x18]1803dc1a4012523.png[/img] and variance [img=18x22]1803dc1a48a9511.png[/img], then A: When n is sufficiently large, the distribution of sample mean is approximately normal distribution. B: When n<10, the distribution of sample mean is approximately normal distribution. C: The distribution of sample mean is nothing to do with n. D: No matter how big n is, the distribution of the sample mean is not going to be close to a normal distribution.
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内容
- 0
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- 1
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- 2
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- 3
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- 4
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