Exam 10: Independent Groups T -Test

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The total variability in the dependent variable,as represented by SSTOTAL,can be split up,or partitioned,into two components,one (SSEXPLAINED)reflecting the influence of the independent variable and one (SSERROR)reflecting the influence of disturbance variables.

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SSEXPLAINED represents

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How do we determine what the nature of the relationship is between two variables?

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Which of the following conditions would make it inappropriate to use an independent-groups t test?

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Eta-squared can range from -1.0 to +1.0.

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The standard deviation of the sampling distribution of the difference between two independent means is called the standard error of the difference between two independent means or,more simply,the standard error of the difference.

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The nature of the relationship in the independent groups t-test is determined by examining___.

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The proportion of sample variability in the dependent variable that is explained by the independent variable is called eta-squared.

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The null hypothesis for an independent groups t test states that _____.

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A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (XS)and large-boned frame (XL).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data: A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (X<sub>S</sub>)and large-boned frame (X<sub>L</sub>).Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data:   What is the null hypothesis? What is the null hypothesis?

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As the alpha level becomes larger,the power of a statistical test ____.

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The degrees of freedom associated with independent Groups t-test is_________.

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What is the rationale for calculating eta-squared following a nonsignificant statistical test?

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The nature of the relationship in the independent groups t test is determined by examining:

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Given the following information,find eta2.SSTOTAL = 653,SSERROR = 405,SSEXPLAINED = 248.

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The measure of the strength of the relationship between the independent and dependent variables in the "cold/warm environment" data is ____.

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Given the following information,find eta2.t = 2.5,n1 = 20,n2 = 18

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Treatment effects are defined as the difference between a given _____ and the _____.

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The standard error of the difference becomes smaller as sample sizes _____ and the variability of the populations_____.

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The independent groups t test requires that n1 equal n2.

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