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The financial aid office of a university asks a sample of graduates about their employment and earnings. They wanted to see if men make more, on average.
The report says, "For academic year earnings, we found on average, men make significantly more money than females (P = 0.028)."
Identify the null hypothesis, the alternative hypothesis and interpret the P-value for the male and female earning report.
Suppose that the amounts that students at a college spend on textbooks this semester have a normal curve with mean µ = $360 and standard deviation s = $120.
In a related sample, participants are related. Participants can be related in one of two ways: They are observed in more than one group.
there are 300 homes in winetree subdivision. the subdivision committee decided to paint a third of the houses magenta
The correlation coefficient between them is 0.4. Your portfolio should have a return of 15%. How many shares of each company should you buy? Find the standard deviation of this portfolio's returns
Consider a different population. Give two examples of different populations that would provide data to answer our general question about inclusion.
In an article in Science, Turner et al. (1998) describe the use of audio, computer-assisted self-interviews as part of the 1995 National Survey of Adolescent Males (aged 15 to 19).
A study conducted by a research program found the 39.5% of college freshmen spent six or more hours a week studying or doing homework during their senior year in highschool.
a marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation.
Arrivals 2011. Will your flight get you to your destination on time? The U.S. Bureau of Transportation Statistics publishes information about airline performance.
C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .002 inch. Calculate the (capability index) for this machine.
The heights in centimeters of 5 students are: 165, 175, 176, 159, 170. The sample median and sample mean are respectively:
A company has $1,00,000 to invest in new R&D projects. The company wants to determine what set of projects should be selected. The following table summarizes the initial cost and revenue potential for each of the projects.
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