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Read the following passage, and answer the questions that follow. A military psychologist is interested in studying the effects of relaxation training on a visual perception test. He gets a group of soldiers and a group of pilots. He exposes the pilots to a relaxation training and then administers the visual perception test to both groups. He finds that the group exposed to relaxation training did much better and concludes this was due to the relaxation technique. 1.Identify a potential extraneous variable. 2.Describe how the extraneous variable might be confounding the results. Your response should be 1-2 sentences long. Write a short response to each of the following in your own words. (5 questions, 1-2 points each, 8 points total) 3.Define and give an example of systematic variability. Your response should be 1-2 sentences long. 4.Define and give an example of random variability. Your response should be 1-2 sentences long. 5.Describe two differences between a between-subjects design and a within-subjects design. Your response should be 2-4 sentences long. 6.Define power. Your response should be 1-2 sentences long. 7.Give an example of what a researcher might do to increase power in a study. Your response should be 1-2 sentences long. Fill in the blank.
8.One strength of ____________________ is that it eliminates random error associated with identified extraneous participant variables. 9.When a researcher doesn't want to leave it to chance that important variables will be equally distributed across conditions, she would employ ____________________ to ensure this happens. 10.____________________ is a fairly easy way to put participants into conditions, though it is not an approach that should be used with small samples. 11.The pre-posttest design is an example of a ____________________ approach to research design. 12.A professor who takes care to make sure her research assistants (those who are in charge of administering the experimental conditions) are of different racial backgrounds, ages, gender, and religions is most likely trying to eliminate ____________________ in her study. 13.When all possible orders of the different levels of an independent variable are used in a repeated-measures design, it is known as ____________________. This differs from ____________________, in which only some of the possible orders are used. Each of these approaches is meant to control for the influence of ____________________.
Calculate a measure of the effect size. Briefly (in less than 100 words) state whether you would accept the store's claim for the effectiveness of the memory booster, and if not, why not
How much money will the concrete wall cost if it is 12 inches thick? How much money will the concrete wall cost if it is 18 inches thick? Develop a formula so you can determine the cost of the wall as a function of its width
Quiz 13. Describe a solid whose volume is represented by the following integral
the perimeter of the basketball court is 114 meters. If the length is 6 more than 2 times the width, what is the width and length?
In Example 3 of Section 2.5, the text shows how to write a system of linear equations using matrix notation. You can similarly write a linear programming problem in matrix notation.
Let A be an n by n matrix, possibly not symmetric. Let B = A + AT . Prove B is symmetric and that B is negative semi-definite if and only if A is negative semi-definite.
Compute the mean and median
Find the length of the internal bisector of the right angle in a triangle with sides 3, 4, 5.
How do you solve a system of linear equations by elimination? Give an example and explain.
A conical paper cup is to have a height of 15 inches. Find the radius of the cone that will result in a surface area of .
The product of the first three elements of a geometric sequence is 216. The numbers a1, a2 and a3 - 3 form consecutive elements of an arithmetic sequence. (a) Find the ratio of the geometric sequence.
The company realizes a revenue of R(x) = -0.08x2 + 180x (0
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