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The administration at a university is interested in studying if any relationship exists between satisfaction at the school and whether the student is a major in the College of Humanities and Social Sciences (HSS major) or has a major in the College of Business (Business major). The school randomly surveys 10 seniors who are HSS students and 10 seniors who are Business students and asks them to rate how satisfied they are at the school on a scale of 1-10, where 10 is extremely satisfied and 1 is extremely dissatisfied. Here are the data:
HSS Major: 7 6 10 4 8 9 6 8 7 10
Business Major: 4 7 4 6 8 7 9 5 8 7
The HSS majors have a mean of 7.5 and a variance of 3.6, whereas the Business majors have a mean of 6.5 and a variance of 2.9. Are the differences found between the HSS majors and Business majors statistically significant?
let us suppose that sat mathematics satm scores in the absence of coaching vary normally with mean 515 and ? 100.
a medical clinic in a small city in the state of washington wants to estimate the mean serum cholesterol level measured
Which trend model is best, and why? If none is satisfactory, explain. Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
in the biathlon event of the olympic games a participant skis cross-country and on four intermittent occasions stops
Flying over the western states with mountainous terrain in a small aircraft is 40% riskier than flying over similar distances in flatter portions of the nation. Find the probability of no accidents in 100,000 flight operations.
the distribution of the sum of independent n? ?2 random variables isa. always approximately normalb. always exactly
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles.
a presidental candidate conducts a poll of likely voters in ohio to determine their mean age answer the following1.
A poll done for Newsweek found that 13% of Americans have seen or sensed the presence of an angel. A contingent doubts that the percent is really that high. It conducts its own survey. Out of 100 Americans surveyed, only 3 had seen or sensed the p..
The faculty senate at a large university wanted to know what proportion of the students thought foreign language classes should be required for everyone.
in a random sample of 200 people 60 were found to participate. a two-sided 95 confidence interval for the true
for the given margin of error and confidence level determine the sample size required. a researcher wants to determine
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