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Girls' cross-country times: a contrast (optional). Continue your analysis of the data from the previous problem by comparing average race time during the first half of the season with the average for the second half. Identify a population contrast L that makes this comparison, estimate this contrast, and state your conclusion.
Plot CEO salaries against the net profit of their respective companies, do you expect to find a linear correlation between the two? Explain.
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.99
the u.s. bureau of labor statistics reports that of persons who usually work full time the average number of hours
warren county telephone company claims in its annual report that the typical customer spends 60 per month on local and
Test the proportions of yellow fire trucks have a significantly lower accident rate.
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
A researcher predicts that the percentage of people who do no watch TV is higher now than before the advent of the Internet. Let the p1 denote the population proportion of American adults in 1975 who reported watching no TV. Let p2 denote the corresp..
For the other 25 percent of the population, the drug has no effect on colds. If an individual tries the drug for a year and has 2 colds in that time, what is the probability that the drug is beneficial to that individual?
explain why we use the notation p lt .05 in the formal test of the hypothesis when there is a significant difference
for 11 repeated independent trials with constant probability of success 0.4 for all trials find the probability of
What value of the sample proportion, p Hat, is required to reject the null hypothesis, given the following sample sizes?
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
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