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What is the approximate minimum percentage of data in any frequency distribution that lies within 3 standard deviations of its mean?
One of the nation's biggest regional airlines has tracked 4,000 landings and take-offs during the past month. Treating these data as the population of interest, the company found that the average time the planes spent on the ground (called the turn t..
A student scored 76 on a general science test where the mean and standard deviation were 82 and 8, respectively he also scored 53 on a psychology test where the class mean and standard deviation were 58 and 3, respectively. In which class was his rel..
Suppose that you have 8 cards. 5 are green and 3 are yellow. The 5 green cards are numbered 1, 2, 3, 4, and 5. The 3 yellow cards are numbered 1, 2, and 3. The cards are well shuffled. You randomly draw one card.
When two variables are correlated, it means that they are associated with one another. But if they are associated with one another, then why doesn't one cause the other?
A sample of 9 production managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000.
For the daily lottery game in Illinois, participants select three numbers between 0 and 9. A number cannot be selected more than once, so a winning ticket could be, say, 307 but not 337. Purchasing one ticket allows you to select one set of num..
Given that the scores on a medical test follow a normal distribution with a mean of 460 and a standard deviation of 100. If all students in a class of 41 attend the test what is the probability that the given class will obtain a mean score of abov..
We are studying hypothesis testing. My instructor asked: Once the p-value is determined, how do you decide whether or not your evidence is strong enough? In other words, what is your criteria for rejecting the null hypothesis?
According to the Center on Budget and Policy Priorities article "Curbing Flexible Spending Accounts Could Help Pay for Health Care Reform" (revised June 10, 2009), flexible spending accounts encourage the over-consumption of health care; people buy t..
"Range of optimality" describes the impact of simultaneous changes in objective function values and right-hand-side values.
The police play a key role in the juvenile justice system because they are, typically, the point of first contact. Their decisions often affect the youth throughout the entire juvenile justice process. For example, depending on the nature of the offe..
Using the information from part by hand, calculate a 90 confidence interval for the difference of the means for the two time periods.
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