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Suppose you have to cross a train track on your commute. The probability that you will have to wait for a train is 1/5, or .20. If you don't have to wait, the commute takes 15 minutes, but if you have to wait, it takes 20 minutes.
a. What is the expected value of the time it takes you to commute?
b. Is the expected value ever equal to the actual commute time? Explain.
Previous studies have indicated the standard deviation of annual earnings for college students is $850. How large a sample would need to be taken to estimate the mean for college students' annual earnings to within $200 with 99% confidence?
a pump adds 48000 ftlbs to a steady flow rate of 5 ft3s . the fluid is water at 60 f. at the entrance to the pump the
question there is some evidence that rem sleep associated with dreaming may also play a role in learning and memory
Do these data indicate that the population mean percentage increase in corporate revenue is greater than the population mean percentage increase in CEO salary?
For the following exercise, complete the following: Find the mean, median, and range for each of the two data sets. Find the standard deviation using the rule of thumb for each of the data sets.
The marketing department likes to know patterns about the consumers who call the 1-800 phone bank with questions/problems.
question a grocery store is hiring 5 new stock-persons for the summer. 19 equally qualified students apply for the job.
In studies examining the effect of humour on interpersonal attraction, McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how the individual was perceived by others.
College Athletics: Graduation Rate. Women Athletes at the University of Colorado Boulder have a long term graduation rate of 67%. Over the past several years, a random sample of 38 women athletes at the school showed that 21 eventually graduated.
spray drift is a constant concern for pesticide applicators and agricultural producers. the inverse relationship
many teens have posted profiles on sites such as facebook and myspace. a sample survey asked random samples of teens
The diversity of bird species in a given area is related to plant diversity, as measured by variation in foliage heighi.5 as well as the variety of flora. Below are indices measured on those two traits for 13 desert-type habitats (113).
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