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A random sample of graduate students were asked, "Would you come back to school to get a second degree if you were given the opportunity?" Out of 150 people surveyed, 127 said yes. What is 95% confidence interval for the proportion who said yes
A study of the Consideration of Future Consequences (CFC) scale found a mean score of 3.20, with a standard deviation of 0.70, for the 800 students
There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 that are possible equals:
What was the standard deviation of these 3,075 runners?
Comparing Salaries The scatterplot shows the salary and year of first employment for some professors at a college.
Convert heights in inches to centimeters by multiplying inches by 2.54. Find a 95% confidence interval for the mean difference as measured in centimeters.
What is the probability of observing exactly 12 accidents during the coming year? - What is the probability of observing no more than 12 accidents during the coming year?
In n independent experimental trials, the relative frequency of event A is n(A). How large should n be to ensure that the confidence interval estimate
In a survey of 240 students in an elementary statistics class at the University of California-Davis (UCD), 20 said that they were left-handed and 220 said.
If he selects the three brands at random, what is the probability that he will select the following?
Problem: Marginal distributions. Give (in percents) the two marginal distributions, for marital status and for job grade.
Which of the critiques of democracy offered by the anonymous author do you consider valid?
A cereal manufacturer seeks to test their newest product against a competitor's. A group of 100 children was asked to evaluate each brand, and then to express a preference. To guard against bias, neither the children, nor the technicians serving t..
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