Psychologists Wish to Evaluate the Consistency of a Standardized Behavioral

question 21

Multiple Choice

Psychologists wish to evaluate the consistency of a standardized behavioral test.The test is designed to have a variance of 225.Twenty randomly sampled tests yield a variance of 240.Assuming the underlying population is normal, what is a 90% confidence interval for the variance of this test?

• A) (151.276, 450.727)
• B) (12.300, 21.230)
• C) (190.542, 328.899)
• D) (138.803, 511.986)

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Definitions:

Bimodal

A distribution with two different modes (peaks) where the data shows two prevalent values.

Skewed

A distribution that is not symmetrical, where the bulk of values are concentrated to one side of the mean.

Innings

A division or segment of a game in sports like cricket and baseball, where one team takes turns batting and the other fields.

Histogram

A graphical representation of the distribution of numerical data, using bars to show the frequency of data in successive numerical intervals of equal size.