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Judgmental samples
a. Keep the accompanying sheet of rectangles covered until the instructor gives the signal to begin. Then look at the sheet for a few seconds and write down your guess as to the average area of the rectangles on the sheet. (The unit of measure is the background square. Thus, rectangle 33 has area 4 X 3 = 12.)
b. Select five rectangles that, in your judgment, are representative of the rectangles on the page. Write down the area for each of the five. Compute the average of the five areas, and compare it to your guess. Are the two numbers close?
c. The instructor will provide you with all class members guesses and the aver~ ages of their subjective samples of five rectangles. Display the two sets of data on separate dot plots. Comment on the shape of these distributions and where they center. Why is the center an important point to consider?
Run a regression analysis of the data and determine whether there is a linear relationship between inflation and total return on stocks for the periods under study.
In a randomized, double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children.
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Stanford Binet IQ scores have a mean of 100 and a standard deviation of 15. Albert Einstein reportedly had an IQ of 160. Convert Einstein's IQ score to a z score.
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The receiver is correct only 85% of the time. What is P(W), the probability of a wrong decision if the probabilities of receiving 0s and 1s are equally likely? What can you conclude from your result?
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Is the hot-air balloon significantly shorter than light rail? How can you tell? What do you tell university officials?
(b) Is the language of this grammar the same as the language of the grammar in Exercise 39? Why or why not?
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question during the past 10 years minnesota pollution control agency has measured the concentration of chlorophyll-a
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