(1)Suppose that, for a *t* test, your computed value for *t* is +3.28. The critical value of *t* is +2.048. Explain what this means. Do you reject the null hypothesis or not? Now suppose that you have 28 degrees of freedom and are using a two-tailed (nondirectional) test. Draw a simple figure to illustrate the relationship between the critical and the computed values of *t* for this result

(2)Explain the purpose of a null hypothesis. Why are both a research/alternative hypothesis and a null hypothesis necessary in statistics?

(3)A researcher computed the F ratio for a four-group experiment. The computed F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the denominator.

a. Is the computed value of F significant at p < .05? Explain.

b. Is it significant at p < .01? Explain

(4)Explain the difference between a *t* test for independent groups and a *t* test for matched groups.

(5) Explain how you would show each of the following in a report:

a. The results of a t test with 38 degrees of freedom, where the obtained value of t was 1.38, and the significance level was p < .20.

b. The proper placement of a figure within the text.

c. The proper placement of a table within the text.

(6) How can internal and external validity be increased in an experiment?

Subject | Mathematics |

Due By (Pacific Time) | 12/04/2015 12:00 am |

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