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A university in your region estimates that verbal GRE scores of students who apply for admission to graduate school can be described by a Normal model with a mean of 550 and a standard deviation of 80. The staff in admissions open the application envelopes at random looking for 10 applicants with GRE scores over 600. How many envelopes do you think the staff will need to open?
Based upon all of this information, do a "goodness-of-fit" test to see if the distributions are the same as they were two years ago. Use a level of confidence of .01. Should we accept Ho or reject Ho?
How do you know if a value is a solution for an inequality? How is this different from determining if a value is a solution to an equation?
Develop a probability distribution for the number of travelers who plan their trips within two weeks of departure.
In a study, 37% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people living close to a nuclear power plant.
Estimate the population in 1600 and graph the population trend from 1600 through to 2000
Approximately 14 percent of the population of Arizona is 65 years or older. A random sample of five persons from this population is taken. The probability that less than 2 of the 5 are 65 years or older is:
A retail federation conducted a nationwide survey of 1000 adults last October and found that approximately 55% of the respondents planned to do some type of Halloween decorating.
How many integers are there between 5 and 14? How Many rational numbers are there between 5 and 14?
The breaking strengths of cables produced by a certain manufacturer have a mean, of 1925 pounds, and a standard deviation of 65 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength.
Investment A has an expected return of $25 million and Investment B has an expected return of $5 million. Market risk analysts believe the standard deviation of the return from A is $10 million
For a population with a mean of (u)=50 and a standard deviation of (o)=10, how much error on average would you expect between the sample mean (M) and the population mean for the following samples
A random variable is normally distributed, with (population mean)= 300 pounds and (standard deviation) = 50 pounds. How small can a simple random sample be if the standard error of the mean can be no more than 20 pounds?
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