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Assuming that the measurements are normally distributed with expectation equal to the correct percentage, each student calculates a 95% condence interval for the percentage based on his or her data. When the results are collected, two of the students discover that their condence intervals dont even overlap. A student in the course who is also taking Stat 311 claims that this result is not surprising. Do you agree?
A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution.
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
For each given pair of numbers find the quadraticequation with integral coefficients that has the numbers as its solutions.
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
Let F be a field and f(x), g(x) be elements of F[x]. Show that f(x) divides g(x) if and only if g(x) is an element of .
Use a one-tailed hypothesis test with an alpha level of .01 to demonstrate. Calculate the estimated r squared, the percentage of variance accounted for, to measure the size of this effect.
Who are also athletes but who are not regularly hit in the heads. Is this an example of an experimental or a non-experimental study? Why?
We have discussed two different methods for making statistical inferences such as developing interval estimates and conducting hypothesis tests. These methods are the "Critical Value Method" and the "P-Value Method".
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
The amount of money spent by a customer is uniformly distributed over (0, 100). Find the mean and variance of the amount of money that the store takes in on a given day.
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