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Based on data from the College Board, assume that SAT scores are normally distributed with a mean of 1518 and a standard deviation of 325. Assume that many samples of size n are taken from a large population of students and the mean SAT score is computed for each sample. If a sample size n is 100, find the mean and standard deviation of the distribution of sample means.
q1. consider an investment portfolio of 50000 in stock a and 50000 in stock b. the expected value of a is 9.5 and b is
the system is released from rest with no slack in the cable and with the spring unstretched. determine the distance s
find the z-scores that separate the middle 71 of the distribution from the area in the tails of the standard normal
Normal distribution with average 500 and SD 100. A college wants their students to be in the top 12.5% for verbal aptitude. What minimum qualifying score should they set?
ben thinks that people living in a rural environment have a healthier lifestyle than other people. he believes the
a computer manufacturer is introducing a new product specifically targeted at the home market and wishes to compare the
the null hypothesis is to be tested at 95% confidence. Determine the critical value(s) for this test.
an article in ad hoc networks discussed an underwater acoustic sensor network to monitor a given area in an ocean. the
A standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.
a random sample of size n100 is taken from a population with a mean u 80 and standard deviation 14. calculate the
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
Ms. Maria Wilson is considering running for mayor of the town of Bear Gulch, Montana. Before completing the petitions, she decides to conduct a survey of voters in Bear Gulch. A sample of 400 voters reveals that 300 would support her in the Novemb..
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