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In given Exercise, estimate the odds ratio and interpret the results.
ExerciseYou randomly sample 200 adults, determine whether their income is high or low, and ask them whether they are optimistic about the future. The results are
Yes
No
Total
High
35
42
77
Low
80
43
123
115
85
200
What is the estimated probability that a randomly sampled adult has a high income and is optimistic? Compute a 0.95 confidence interval for the true probability using the R function binomci. What is the estimated probability that someone is optimistic, given that the person has a low income?
Some industrial suppliers make above-average profits by offering service, selection and reliability at a premium price. How might these suppliers segment the market to locate customers who are willing to pay more for these benefits?
What is the probability that Toyota will sell between 55,000 and 65,000 passenger cars during the next year?
in a study comparing four levels of factor a and two levels of factor b with six observations in each cell the sse3456
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
Which method had the higher (better) median score?- Was that method always best?- Which method produced the most consistent results? Explain.
A random sample of 50 iPhones had an average better life of 5.7 hours. Determine the margin of error (in hours) for the 90% confidence interval for this sample.
the random walk theory of prices of securities states that price movements in disjoint time periods are independent of
Population standard deviation is known to be 8 grams. Determine and interpret p-value for testing that mean weight of Take-a-Bite is less than 175 grams.
Explain why a strong correlation would be found between weekly sales of firewood and weekly sales of cough drops over a 1-year period. Does the strong correlation mean that one variable causes the other?
The president of the United States is thought to have a positive approval rating of 58% of the people at a certain time. In a random sample of 1200 people, what is the approximate probability that the number of positive approvals will be at least ..
Let the stochast X = the maximum number of dots of two sides of one domino stone and let the stochast Y = the minimum number of dots of two sides of one domino stone. Further let the difference stochast D = X - Y. Calculate:
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