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The approach used in Problem 1(e) led to a disastrous prediction in the 1936 presidential election, in which Franklin Roosevelt defeated Alfred Landon by a landslide. A Landon victory had been predicted by the Literary Digest. The maga- zine based its prediction on the preferences of a sample of voters chosen from lists of automobile and telephone owners.
(a) Why do you think the Literary Digest's prediction was so far off ?
(b) Has anything changed between 1936 and now that would make you believe that the approach used by the Literary Digest would work better today?
Death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5. Can we conclude from this that most workers there earn between $25 and $35..
Which measure of association do you use to compare the relationship between these variables? Why?
We want to know if, at the α = 0.05 level, there is sufficient evidence to conclude that the average calorie content of 1-ounce chocolate chip cookies produced by this brand is greater than 110 calories.
How do you solve this problem: a researcher conducted a study of the access speed of 50 hard drives and concluded that his maximum error of estimate was 24.
positive correlation between CEO salary and the Stock Price, and therefore, for the good sake of the company's stock value, his salary should be increased. Do you agree with his argument? Explain why or why not.
How large a sample is required to estimate the mean speed with a margin of error equal to 2 miles per hour with 90% confidence?
recently a group of adults who swim regularly for exercise were evaluated for depression. it turned out that these
If 2 circuit boards are selected at random without replacing the first, what is the probability both circuit boards are defective?
Very satisfied customers give the XYZ-Box video game system a rating that is at least 42. In the context of this situation, interpret making a Type I error; interpret making a Type II error.
a particular pitching machine is manufactured so that it will throw the ball into the strike zone of a 6-foot batter 90
These data represent the number of students attending a high school. Draw a line graph for the data.
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