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Chapter 8: Q.34 (page 479)
Fill in the blanks on the graph with the areas, upper and lower limits of the confidence interval, and the sample mean.
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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
Using the same p鈥� and n = 80, how would the error bound change if the confidence level were increased to 98%? Why?
During the 2013 regular NBA season, DeAndre Jordan of the Los Angeles Clippers had the highest field goal completion rate in the league. DeAndre scored with 61.3% of his shots. Suppose you choose a random sample of 80 shots made by DeAndre during the 2013 season. Let X = the number of shots that scored points.
a. What is the probability distribution for X?
b. Using the formulas, calculate the (i) mean and (ii) standard deviation of X.
c. Use your calculator to find the probability that DeAndre scored with 60 of these shots.
d. Find the probability that DeAndre scored with more than 50 of these shots
If the Census wants to increase its level of confidence and keep the error bound the same by taking another survey, what changes should it make?
Which distribution should you use for this problem?
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