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Presentation transcript:

Mystery 1Mystery 2Mystery 3

The axiom that states “sampling distributions of means will tend toward Normality when n is large.”

What is the Central Limit Theorem?

A single value that predicts the value of the parameter.

What is a point estimate?

A range of values that attempts to capture a parameter.

What is a confidence interval?

This is the lower end of the confidence interval?

What is the lower confidence limit?

Half of the confidence interval length (quantifies precision).

What is the margin of error?

This is a test for which the alternative hypothesis considers values on both sides of the null.

What is the two-sided test?

This is what a statistician says when the population standard deviation for the variable comes from a source outside the data.

What is “when σ is known”?

The test statistic used to conduct a test of a mean when σ is known.

What is a z statistic?

The probability distributions that resemble Normal distributions but with broader tails.

What are Student’s t distributions?

Members of the t distribution family are defined by this parameter.

What are their degrees of freedom ?

The test statistic used to test two means when the population standard deviation is not known.

What is a t statistic?

This is the upper end of the confidence interval.

What is the upper confidence limit?

The upper confidence limit minus the lower confidence limit; twice the margin of error.

What is the “confidence interval length”?

The term that mean “the probability of less or equal to a given value.”

What is the cumulative probability?

A value for a t random variable that is greater than p × 100% of the other t values.

What is a t percentile?