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The Federal Bureau of Investigation (FBI) trains sniffer dogs to find explosive material. At the end of the training, Maggie, the FBI's prize dog, is let loose in a field with four unmarked parcels, one of which contains the Semtex explosive. An experiment is performed 10 times to see if Maggie correctly identifies the correct parcel. Maggie correctly identifies the correct parcel 8 of the 10 times. Is Maggie better than an untrained dog? Assume that an untrained dog has a probability of 0.25 of successfully identifying a parcel containing explosives. Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
If a lot is known to contain 10% defective items, find out the probability that lot will be rejected? Accepted?
We are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is:
Conduct a statistical test to determine if the sample is representative of the population.
Depends on the satellite information illustrate what is the expected number µ of real forest fires on the Seward Peninsula.
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
The life of a calculator manufactured by Intel corporation has a normal distribution with a mean of 50 months and a standard deviation of one year.
What proportion of the variability in steel shipments for motor vehicles is described by regression equation?
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
The first three digits of a university telphone exchange are 452. if all the sequences of the remaining four digits are equally likely, what is the probability that a randomly selected universtiy phone number contains seven distinct digits?
Would it be sensible to conclude that more than 10% of applicants are now failing the test?
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