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MP-3 players, and most notably the Apple iPod, have become an industry standard for people who want to have access to their favorite music and videos in a portable format. The iPod can store massive numbers of songs and videos with its 120-GB hard drive.
Although owners of the iPod have the potential to store lots of data, a recent study showed that the actual disk storage being used is normally distributed with a mean equal to 1.95 GB and a standard deviation of 0.48 GB. Suppose a competitor to Apple is thinking of entering the market with a low-cost iPod clone that has only 1.0 GB of storage. The marketing slogan will be "Why Pay for Storage Capacity that You Don't Need?" Based on the data from the study of iPod owners, what percentage of owners, based on their current usage, would have enough capacity with the new 1-GB player?
Students given exam with 300 multiple questions, distribution was normal and mean 195 with a standard deviation of 30. What were the scores of the students who are within one standard deviation of the mean?
a researcher wishes to compare how students at two different schools perform on a math test. he randomly selects 40
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.
It is known from previous studies that the population variances are 8.1 and 7.3 respectively. Using a level of significance of .01, is there evidence that the out of state students may be receiving lower grades? Fully explain your answer.
what effect does the sample size have upon the maximum error of
Explain how the power of hypothesis test is influenced by each of the following. Assume that all other factors are held constant. Increasing the alpha level from .01 to .05.
A random sample of five accidents resulted in the following number of persons injured: 18, 15, 12, 19, & 21. Using the .01 significance level, can we conclude the population mean is less than 20 for all accidents?
Calculate the suitable mean response time from both proposed locations and find out which proposed site must be selected for the new emergency facility.
Which of the following terms describes the overall long-term tendency of a time series?
what is the probability that a sample mean calculated from a sample of 100 individuals will have an average age between
Let X1,..., Xn be a random sample from a population with density re-(x-θ), for x > θ f(x) = 0, otherwise.
What do we use the F Distribution to test? Provide an example from your place of employment or circle of influence of an instance when you could use the F Distribution.
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