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Is the difference significant? Tom wonders if two-bedroom apartments rent for significantly more than one-bedroom apartments. Use the data in the previous exercise to find out.
(a) State appropriate null and alternative hypotheses.(b) Report the test statistic, its degrees of freedom, and the P-value. What do you conclude?(c) Can you conclude that every one-bedroom apartment costs less than every two-bedroom apartment?(d) In the previous exercise you found a confidence interval. In this exercise you performed a significance test. Which do you think is more useful to someone planning to rent an apartment? Why?
A person purchases a package of 10 ball-point pens which, unknown to the purchaser, contains 4 defective pens. Of the first 2 pens used by the purchaser
Does a regression model imply causation? Why or why not? Provide an example which provides and independent and dependent variable from your place of work.
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
Explain five steps used in hypothesis testing. Be specific, using numerical examples as well as symbols and verbal explanations.
Determine the probability that we would reject null hypothesis given that it is true?
How much do typical employee and his or her family spends per year on dental expenses? Sample of 45 employee reveals mean amount spend last year was $1,820, with standard deviation of $ 660.
A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the population of lifetimes of the components is a normal distribution with mean of 84 months and standard deviation of 10 months.
The fixed monthly cost of operating the production facility is $3000. How many units of part # 2206 have to be sold in a month to break-even?
What is the value of the slope of the least squares regression line for these data? Round your answer to at least four decimal places.
What is the expected number of students who have registered on a pass/fail basis? What is the probability that more than three are registered on a pass/fail basis?
Use the Wilcoxin Rank Sum test for independent samples to determine if the median age of a car and a taxi are different.
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