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Statistics for The Behavioral

Statistics

Quiz 8 :

Introduction to the T Test: Single Sample and Dependent Means

Quiz 8 :

Introduction to the T Test: Single Sample and Dependent Means

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

D

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

B

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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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Answer:

C

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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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The __________ is a hypothesis-testing procedure used when a sample mean is being compared to a known population mean and the population variance is unknown.
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For the following question(s): A school counselor tests the level of depression in fourth graders in a particular class of 20 students. The counselor wants to know whether the kind of students in this class differs from that of fourth graders in general at her school. On the test, a score of 10 indicates severe depression, while a score of 0 indicates no depression. From reports, she is able to find out about past testing. Fourth graders at her school usually score 5 on the scale, but the variation is not known. Her sample of 20 fifth graders has a mean depression score of 4.4. Use the .01 level of significance. -The counselor calculates the unbiased estimate of the population's variance to be 15. What is the variance of the distribution of means?
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Which of the following is TRUE?
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What is the main difference between Z score and t score?
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