A Researcher Wishes to Determine the Difference in Two Population

question 68

Multiple Choice

A researcher wishes to determine the difference in two population means.To do this, she randomly samples 9 items from each population and computes a 90% confidence interval.The sample from the first population produces a mean of 780 with a standard deviation of 240.The sample from the second population produces a mean of 890 with a standard deviation of 280.Assume that the values are normally distributed in each population.The point estimate for the difference in the means of these two populations is _______.

• A)-110
• B)40
• C)-40
• D)0
• E)240

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Definitions:

Myelination

The process in which neurons are coated in a fatty substance, myelin, which contributes to faster neural communication.

Synaptic Pruning

The process by which synapses, neural connections that are seldom used, disappear.

White Matter

Myelinated brain tissue.

Facial Processing

The interpretation and recognition of human faces, including emotional expressions and identity, by the brain.