In practice, what do we use when σ is unknown?
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Does ¯x−μos√n¯¯¯x−μos√n have a standard Normal distribution?
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True or false: Every t distribution is specified by its df (degrees of freedom).
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True or false: A t distribution with 8 degrees of freedom has a smaller mean than the standard Normal distribution.
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True or false: A t distribution with 3 degrees of freedom has a smaller spread than the standard Normal distribution.
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True or false: As degrees of freedom increase, t density curves get closer to the standard Normal curve.
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Fill in the blank: A t distribution with 5 degrees of freedom is _____________ a t distribution with 14 degrees of freedom.
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Why is a t distribution with 5 degrees of freedom more spread out than the standard Normal distribution?
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True or false: We must always use a t distribution whenever we use s to estimate σ.
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