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Statistics for The Behavioral

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Quiz 8 : Introduction to the T Test: Single Sample and Dependent Means

If you know the sample's variance but not the population's variance:
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D

The variance of a sample is said to be "biased" because it consistently __________ the actual variance of the population.
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B

A local newspaper reports that young women in your town (i.e., a known population)sleep an average of only 5 hours per night. However, you think that women in your town who are enrolled at your college sleep more than that. You randomly select 200 women from your college and ask them to accurately record their hours of sleep. You find that they sleep an average of 7 hours per night. What test would you use to determine whether this mean difference is statistically meaningful?
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C

Gosset discovered the t distribution while attempting to:
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Which of the following is TRUE about t distributions?
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The number of scores free to vary when estimating a population parameter is/are:
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When estimating the population's variance from the scores in a sample, you should:
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The t test is sometimes called __________ because its main principles were developed by William Gosset who published his articles anonymously using the name "__________."
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A sample has individuals with scores of 1, 3, 5, 6, and 6. What is the estimated population variance?
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If a sample has 45 people in it, the degrees of freedom used in the formula to estimate the population variance would be:
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In the formula for estimating the population variance from the scores in a sample, the sum of squared deviations is divided by:
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Suppose the counselor tested the null hypothesis that fourth graders in this class were less depressed than those at the school generally. She figures her t score to be .20. What decision should she make regarding the null hypothesis?
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All of the following statements are true about t tests EXCEPT:
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If a sample has 27 people in it, the degrees of freedom used in the formula to estimate the population variance would be:
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A sample has three individuals, with scores of 2, 3, and 4. What is the estimated population variance?
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When estimating the variance of a population from the sample, you cannot use the sample's variance directly because:
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