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Given the mean of the difference scores is 7.0, standard deviation of the difference scores is...

Given the mean of the difference scores is 7.0, standard deviation of the difference scores is 2.8, and there were 25 in the sample, solve for the following problems, showing all work to receive full credit:

6) Solve for the standard error of the difference scores:

Work:

Answer:

7) Calculate the correlated-groups t test to determine the tobt.

Work:

Answer:

8) If this is a non-directional test, what is the t cv?

(No work needed)

Answer:

Identify the statistical test that should be used to analyze the data for the following study:

9) Does a GRE prep course improve GRE scores? GRE practice test scores were compared before and after 40 students had taken a very expensive GRE prep course.

Answer:

Given a result of t (60) = 1.75 for a one-tailed paired samples t-test, answer the following:

10) What is the sample size?

Answer:

11) What is the tcv?

Answer:

12) What is the tobt?

Answer:

13) What should the researcher conclude (reject or fail to reject the null hypothesis)?

Answer:
Math   Statistics-And-Probability   
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