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To plan the budget for next year a college needs to estimate what impact the current economic downturn might have on requests for financial aid by next year's freshmen class. Historically 35% of freshmen at this college have needed financial aid. In a random sample of 150 freshman applications received thus far, 67 of the applicants request financial aid. Is there evidence that the proportion of next year's freshmen class needing financial aid has increased?
Using the p- value approach, test the hypotheses at the 5% level of significance.
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
Based on the information in part (a), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300.00?
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
The following table presents data on political party affiliation and class level for sample of students in certain university: If the student is selected at random from sample, determine the probability that student is Republican.
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
To evaluate the effect of a treatment , a sample of n=9 is obtained from a population with a mean of m=40 and the treatment is administered to the individuals is found to be M-33
You do not need to collect data and actually conduct the test calculations. Rather,state the claim, define the null and alternate hypotheses, identify the test significance and the test statistic, and state the decision rule that will be used.
A manufacturer claims that the mean lifetime, mu, of its light bulbs is 44 months. The standard deviation of these lifetimes is 7 months. Seventy bulbs are selected at random, and their mean lifetime is found to be 43 months.
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
Correlation rule states that if X and Y are correlated, X has caused Y.
Determine a 95% confidence interval for true mean cost to repair this type of car.
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