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A senior psychology major performed the same experiment on three groups and obtained means of 74, 69, and 75 percent correct. The groups consisted of 12, 31, and 17 participants, respectively. What is the overall mean for all participants?
Estimate the true proportion of college students who believe in the possibility of haunted places with 99% confidence. According to Time magazine, 37% of americans believe that places can be haunted.
classified ads in newspaper offered for sale several used cars of the same make and model. listed below are the ages of
find the probabality that at most 55 will be defective and find the probability that between 50 and 66 will be defective
Calculate the mean and standard deviation talking time for the old battery. (Use the statistics functions on your calculator to find these values). The following table shows the talking time descriptive statistics, for the newly developed battery.
Instead, it is expected to increase by only r SDs. For a given value of x, how do we estimate the average value of y we would expect?
For this assignment, you will write a 2-3-page essay (double-spaced, 1-inch margins) providing examples of how some facet of "process philosophy" has impacted American government and/or society. You may focus on just 1 example, or you may discuss ..
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
a history professor decides to give a 12-question true-false quiz. she wants to choose the passing grade such that the
A manufacturer ships toasters in cartons of 50. In each carton, they estimate a 2% chance that one of the toasters will need to be sent back for minor repairs. In a batch of 25,000 toasters, what are the chances that fewer than 475 need to be retu..
If you test the null hypothesis at the 0.01 level of significance, is there evidence that the new process has reduced turnaround time? Interpret the meaning of the p-value in this problem.
A company believes its market share is about 14%. Find the minimum required sample size for estimating the actual market share to within 5% with 90% confidence.
The scheduled commuting time on the Long Island Rail Road from Glen Cove to New York City is 65 minutes. Suppose that the actual commuting time is uniformly distributed between 64 and 74 minutes.
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