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A 15-ft diameter wind turbine operates in a 25 ft/sec wind at 1 atm and 60 degrees F. The turbine is used to pump 60 degrees F water from a 30-ft-deep well. How much water (in cubic feet per second) can be pumped if the overall effciency of the wind-turbine pump system is 0.25?
A study of vehicle flow characteristics on acceleration lanes found that one out of every six vehicles uses less than 1/3 of the acceleration lane before merging into the traffic.
Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have Z scores (a) above .10, (b) below 10, (c) above .20, (d) below .20, (e) above 1.10, (f) below 1.10, (g) above -.10, (h)..
A consumer watchdog agency selects a random sample of 40 taxpayers. What is the standard error of the mean? What is the likehood the sample mean is greater than 320 minutes?
One state lottery has 500 prizes of $1, 75 prizes of $15, 15 prizes of $100, 5 prizes of $450, 2 prizes of $1225, and 1 prize of 2500. Assume that 28,000 lottery tickets are issues and sold for $1. What is the lottery's expected profit per ticket?
In an exam, the mean score is 70 and the variance is 16. What is the probability that a student's score will lie within the "54 to 86" range?
To test whether there is significant mean difference between two groups using independent sample t test.
Let the random variable x represent the number that are not correctly calibrated. Find the mean and standard deviation for the random variable x.
A data set of ordered pairs with a negative linear correlation has a coefficient of determination of 85.2%. What is the linear correlation coefficient?
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
one sample of n 8 scores has a variance of s2 6 and a second sample of n 8 scores has s2 10. if the pooled variance
One school found that 28.6% of all students are liberal. You wonder whether this percentage is different at your school, but don't know whether it's higher or lower. What hypotheses will you test to see if your school significantly differs from th..
question if a point inside a sphere is selected at random what is the probability that the point is nearer to the
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