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Chapter 8: Q.3 (page 477)
Which distribution should you use for this problem?
The distribution is.
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Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as non-manual wage earners, 250 identified themselves as midlevel managers, and 160 identified themselves as executives. In the survey, 82% of manual laborers preferred trucks, 62% of non-manual wage earners preferred trucks, 54% of mid-level managers preferred trucks, and 26% of executives preferred trucks
Construct a 95% confidence interval. State the confidence interval, sketch the graph, and calculate the error bound
What will happen to the confidence interval obtained, if newborn elephants are weighed instead of ? Why ?
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.
Calculate the following:
a. x = _______
b. n = _______
c. p′ = _______
A sample of heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was pounds with a standard deviation of pounds. The population standard deviation is known to be pounds.
Identify the following:
a.
b.
C.
Construct a confidence interval for the population mean time to complete the forms. State the confidence interval, sketch the graph and calculate the error bound.
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