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The length of children's full-length movies are known to follow a normal distribution with a mean of 78 minutes and a SD of 25 minutes. Calculate the probability that a random sample of 40 children's full-length movies produces an average length of 85 minutes or more.
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
The company investigating the golf balls is not satisfied with the limited analysis that it has done. The managers have collected a good deal of data, but they are not sure how to look at them and interpret the output.
100 M&M candies are randomly selected. The 100 weights have a standard deviation of 0.0518 g. Construct a 95% confidence interval estimate of the standard deviation of weights of all M&Ms.
About one-third of the students entering a certain university drop out during or at the end of their first year." Does this statement illustrate percentage, proportion or probability?
The data below are the numbers of hours of homework done as reported by 24 high school juniors for the last week in September 2006.
In the Cash Now lottery game there are 10 finalists who submitted entry tickets on time. From these 10 tickets three grand prize winners will be drawn.
Repeating this experiment many times with different samples, what values for the sample means would be possible? What values would repeat more often?
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
Capital punishment law is among the most complex bodies of law in the US. As a result of frequent errors, the Trial Judges Assn. has developed a special training course to try to cut down on the errors.
Women make up 24% of the science and engineering workforce. In a random sample of 400 science and engineering employees, what is the probability that more than 120 are women?
If each professor has an equal chance of being selected, what is the probability that both professors are chemistry professors?
Suppose we want to compare the observed and expected number of events among the group 250 treatments.
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