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A retailer of tapes and compact disks wants to test whether people can dif- ferentiate the two products by the quality of sound only. A random sample of con- sumers who agreed to participate in the test and who have no particular experience with high-quality audio equipment is selected. The same musical performance is played for each person, once on a disk and once on a tape. The listeners do not know which is playing, and the order has been determined randomly. Each person is asked to state which of the two performances he or she prefers. What statistical test is most appropriate here? Why?
a statistics professor has asked his students to flip coins over the years. he has kept track of how many flips land
What is the probability that there are less than 500 nails in a randomly selected five pound box of nails?
the lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. random
1. the instructor in a humanities class says that students have a 15 probability of making an a in her class 20
A project being analyzed by PERT has 38 activities, 16 of which are on the critical path. If the estimated time along the critical path is 90 days with a project variance of 25, the probability that the project will be completed in 88 days or less..
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
Explain why the allocation that would occur if consumers could costlessly resell a good is the same as the allocation from efficient rationing.
A random sample of 8 recent batches produced the following yields. Conduct a hypothesis test to determine whether the true mean yield has decreased. Use an a=0.01
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
Draw the histogram for these data using an initial class boundary of 29.5 and a class width of 6. Note that you can add or remove classes from the figure
The results of a recent poll on the preference of shoppers regarding two products are shown below.
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