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Chapter 8: Q. 116 (page 489)
What is the error bound?
c.
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In words, define the random variable .
Identify the following:
a. x=_______
b. sx =_______
c. n =_______
d. n – 1 =_______
Of randomly selected adults, identified themselves as manual laborers, identified themselves as non-manual wage earners, identified themselves as midlevel managers, and identified themselves as executives. In the survey, of manual laborers preferred trucks, of non-manual wage earners preferred trucks, of mid-level managers preferred trucks, and of executives preferred trucks
The sampling error given in the survey is . Explain what the means.
Using the same mean, standard deviation, and level of confidence, suppose that n were 69 instead of 25. Would the error bound become larger or smaller? How do you know?
The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning ice-skating class was picked. In that class were 64 girls and 16 boys. Suppose that we are interested in the true proportion of girls, ages 8 to 12, in all beginning ice-skating classes at the Ice Chalet. Assume that the children in the selected class are a random sample of the population.
In words, define the random variable X.
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