The Pooled-Variance Estimator $s _ { p } ^ { 2 }$

question 31

True/False

The pooled-variance estimator, $s _ { p } ^ { 2 }$ , requires that the two population variances be equal.

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Definitions:

Population Parameter

A numerical value that describes a characteristic of an entire population, such as its mean or standard deviation.

Sample Statistic

A numerical measure that describes some characteristic of a sample, such as the sample mean or sample standard deviation.

50th Percentile

Also known as the median, it is the value below which 50% of the observations in a group of data fall.

N - 1

A formula used to calculate the sample variance or sample standard deviation, representing the sample size minus one.