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An optometrist is interested in the effects of different brands of eye drops. She wants to know if different drops affect the accuracy of a standard vision test. Statistics Assignment Page 2 of 2 Choosing the Design of an Experiment Some researchers think that Brand A may have more adverse effects on an individual's ability to correctly report the letters in the vision test than Brand B or Brand C. There is also some speculation that the effect of the drops on vision differs dramatically for individuals who are far-sighted compared to those who are near-sighted. The optometrist hires you to design an experiment that tests the effect of the eye drops on test performance. You tell her there are two possible approaches to take: a randomized comparative approach or a matched pairs design. Describe how you would use each design to test the effect of the eye drops on test performance on a random sample of patients. Remember, there is a concern about the effects for near vs. far-sighted patients. As much as possible, use diagrams instead of words to summarize your experimental design.
How much should you be willing to pay for Bond X today? (Hint: You will need to know how much the bond will be worth at the end of 5 years.)
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
Credit derivatives are a new kind of investment instrument: they protect investors from risk. - What is the chance that at least one investment will make money?
What are ways that I could explain these principles? Chapter 10 Big Ideas of Sampling:
If the consumer advocate plans to purchase 100 boxes of the product, then file suit against the company if more than 5 of the boxes have content weights below the 20-ounce stated weight on the package, what is the probability that she will end up ..
Evaluate whether both proposed designs would achieve the same mean unconfined compressive strength of core (in psi) or not at .05 under equal (σ12=σ22) *AND* unequal (σ12≠σ22) variance assumptions.
Find the mean and the standard deviation. If we toss a fair coin 100 times, the number of heads is a random variable that is binomial.
SAT verbal scores are normally distributed with a mean of 494 and a standard deviation of 97. Use the Empirical Rule to determine what percent of the scores lie between 300 and 591.
for each of the following variables determine whether the variable is categorical or numerical. if the variable is
Find the area to the right of x=41 under a normal distribution curve with µ=32 and s=6.
Find a lower bound for the probability that the student's score will fall between 65 and 75 - If 100 students take the final, find a lower bound for the probability that the class average will fall between 65 and 75.
Environmentalists are concerned about emissions of sulfur dioxide into the air. The average number of days per year in which sulfur dioxide levels exceed.
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