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Oil Drilling: A geologist is using seismographs to test for oil. It is found that if oil is present, the test gives a positive result 95% of the time, and is oil is not present; the test gives a positive result 2% of the time. Oil is actually present in 1% of the cases tested. If the test shows positive, what is the probability that oil is present?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
A study of 600 college students taking Statistics 101 revealed that 54 students received the grade of A. Typically 10% of the class gets an A. The difference between this group of students and the expected value is not significant at the 0.05 leve..
a cola-dispensing machine is set to dispense a mean of 2.026 liters into a container labeled 2 liters. actual
the following graph shows the population of washington d.c. in 2000 and in 2010. what is wrong with this graph? draw a
a. Select the variable Sales. Develop a frequency distribution and histogram for Sales. b. Compute the mean, median, and standard deviation for the Sales variable. c. Determine the interquartile range for the Sales variable.
assume that a procedure yields a binomial distrubition with a trial repeated n times. use the binomial probability
What percent of people surveyed were Republicans?- Do you think this might be a reasonable estimate of the percentage of all voters who are Republicans? Explain.
The firm for which you are working is growing. They have announced that they will open facilities in ten states. Calculate the mean, median, mode, variance, and standard deviation for both the sample and the population
Find the mean, median, mode, variance and standard deviation for the following data set:
suppose a life insurance company insures the lives of 1000 men aged 30. if actuarial studies show that the probability
To determine whether having relationship with the opposite sex in college is detrimental to one's grade, the following grade point averages of 10 students were.
Derive the density function of the random variable Z = Y1Y2 management of a fast-food outlet is interested in the joint behavior of the random variables
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