ANSWER EVERY QUESTION (in Testing Your Knowledge 17.1, Testing Your Knowledge 17.2, and Testing Your Knowledge 17.3)

Lab 17.10 Psychology 129 Lab 17.13 Name Testing Your Knowledge 17.1 1. Define: between-subjects design, confound, confounding, control group, convenience sampling, dependent variable, equivalent groups, experiment, extraneous variable, factor, independent variable, level of an independent variable, one-factor between-subjects design, placebo control, random assignment, random sampling, research hypothesis. 2. What is the purpose of creating equivalent groups? What method is used for creating equivalent groups? 4. When does confounding occur in an experiment? 6. An experimenter is investigating the effects of noise on the performance of a tracking task. The task is to use a mouse to keep a cursor on a computer screen on a randomly moving target clot. The dependent variable is the amount of time a person is able to keep the cursor on the clot. The experimenter hypothesized that subjects performing the task when no environmental noise is present will keep the cursor on the target for a greater amount of time than subjects who perform the task while listening to a loud noise. Each action by the experimenter that is described next confounds this experiment by letting an extraneous variable vary systematically with the independent variable of noise condition. For each action, identify the extraneous variable confounding the experiment and then explain why the experiment is confounded. 6a. The experimenter assigns ten 20yearold males to the nonoise condition and ten 60year old males to the noise condition. 6b. The experimenter urges the subjects in the nonoise condition to try very hard, but does not encourage the subjects in the noise condition. 6c. The experimenter assigns males to the no-noise condition and females to the noise condition. 6d. The experimenter assigns physical education majors to the no-noise condition and social science majors to the noise condition. 6e. Subjects in the no-noise condition do the experiment between 9:00 and 10:00 A.M., and subjects in the noise condition do the experiment between 4:00 and 5:00 P.M. Testing Your Knowledge 17.2 1. Define: empirical sampling distribution ofthe difference between means, standard error of the difference between means, theoretical sampling distribution of the difference between means. Lab 17.10 3. Calculate SKIE for each ofthe following sets of scores. a. Group b. Group X1 X2 X1 X2 104 99 77 82 l 11 107 84 86 120 105 68 78 113 110 71 74 108 115 82 69 79 80 c. Group X1 X2 71 85 82 80 63 73 74 76 68 70 76 67 Testing Your Knowledge 17.3 3. Write the statistical hypotheses for find for a two-tailed test. 4. To what situation in an experiment does H0 correspond? 5. To what situation in an experiment does H1 correspond? 9. For problems 1 and 2 presented below, answer the following questions. Use a two- tailed test and a .05 significance level for each problem. State the statistical hypotheses for rind for these scores. What are the df for this 1? What is the value oftcm? What. are the rejection regions for tubs? What is the value of tubs? e999?! Does tubs fall into a rejection region? . What decisions do you make about the statistical hypotheses\"? Do you reject or fail to reject H0? Accept or not accept H1? {12 h. Do you conclude that the sample means are from the same or different populations? i. Is the difference between the means statistically significant? j. Did the groups differ significantly in their estimates of the time they spent waiting? If so, what is the direction of the difference? 10. List the five-step hypothesis testing procedure