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Question: Run times. One of the authors collected the times (in minutes) it took him to run 4 miles on various courses during a 10-year period. Here is a histogram of the times.
Describe the distribution and summarize the important features. What is it about running that might account for the shape you see?
A researcher obtains a significant interaction and a significant main effect. Which significant effect should the researcher typically analyze first? Explain.
If it's appropriate, find a 90% confidence interval for the proportion of houses in this zip code that have swimming pools. If it's not appropriate, explain and/or recommend an alternative action.
What kind of bias does Barone claim may exist in polls?- What is the population for these surveys?- What makes you think these results are incomplete?
It is well known that similarity in attitudes, beliefs, and interests plays an important role in interpersonal attraction (see Byrne, 1971, for example). Thus, correlations for attitudes between married couples should be strong. Suppose a researcher ..
Passing stats. Molly's college offers two sections of Statistics 101. From what she has heard about the two professors listed, Molly estimates that her chances.
Test at the 0.05 level of significance whether the mean of a random sample of size n = 16 is "significantly less than 10" if the distribution from which the sample was taken is normal, = 8.4, and σ = 3.2. What are the null and alternative hypoth..
The State Transportation Department is interested in estimating the proportion of vehicle owners that are operating vehicles without the required liability insurance.
Find the mean lifetime of this device? A electrical device consists of 4 identical components arranged so that the device functions if and only if all four components are working.
Assuming that the Aberdeen manager sets the mean fill at 12 ounces, what is the probability that a can will contain a volume of Coke product.
if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A. than in Germany
20 of all cartons of milk ordered for school lunches are defective in some way. five such milk cartons are randomly
What type of solution do you get for a quadratic equation where D
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