Please help me out. Please.

label Statistics
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Which statement correctly compares t-distributions to the normal distribution?

I.  t-distributions are also unimodal, mound shaped and symmetric.

II.  t-distributions have more spread than the normal distribution.

III.  As degrees of freedom decrease, the variance of t-distribtuions becomes smaller.

1.  II only

2.  I and II only

3.  I only

4.  I and III only

Apr 27th, 2015

III is not correct. With more  degrees of freedom (really estimates of mean with more samples) its variance decreases.

II is true - the t-distribution has larger tails than the normal distribution and its peak is smaller.

I is also true - the t-distribution is symmertic, mound shaped and unimodal (have one maximum)

so 2 it is.

Apr 27th, 2015

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Apr 27th, 2015
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Apr 27th, 2015
Sep 24th, 2017
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