When Determining the Pooled Population Variance Estimate in a T

question 11

Multiple Choice

When determining the pooled population variance estimate in a t test for independent means:

• A)the variance of at least one of the original populations must be known (as opposed to estimated), but the other can be estimated from sample scores
• B)the variance of BOTH of the original populations must be known, as opposed to estimated
• C)the estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants
• D)the scores from both samples are combined to form a single sample, and the estimated variance is figured in the usual way, but using this combined sample

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Definitions:

Retinal Disparity

This term refers to the slight difference in the visual images that each eye perceives due to the eyes’ horizontal separation. It is a critical binocular cue that allows for depth perception.

Different Images

Visual or mental representations that are not identical, highlighting diverse perceptions or interpretations.

Left Eyes

The eyes positioned on the left side of one's face, contributing to binocular vision and depth perception.

Binocular Cue

Visual information taken in by two eyes that enable us to gain a sense of depth and three-dimensional perception.