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Here's the q': In a recent survey amongst college students, it was found that 40% were graduates of public schools. The survey revealed that 20% of college students are maintaining a GPA of at least 2.5. A student is selected at random and found to have a GPA of less than 2.5, what is the probability that the student is from a private school?
At one university, the distance to students' home is normally distributed with a mean of 200 miles and a standard deviation of 25 miles.
Using a 1% level of significance, can we say that there is a difference in the average waiting time between the two shops? Find the critical value(s).
Conduct the hypothesis test and provide the test statistic, critical value and/or P- value and state the conclusion.
If she performs 15 demonstrations this week, what is the probability of her being satisfactory? What is the probability of between 4 and 8 (inclusive) orders?
Manufacturer of mole and gopher poison has experienced the following monthly demand for an environmentally sound pesticide poison. Using a Average method, what would the forecast have been for July?
Families of size 4 spent a population mean of $360 on a visit to an amusement park, standard deviation of $50 in October 2000. Operators want to know whether families will spend more in 2001.
If the company's report is correct, what is the probability that the average balance of an account in the sample is $394 or less?
They hope to use a sample size such that, with probability 0.95, the error will not exceed 0.04. What sample size will ensure this, regardless of what sample proportion value occurs when they gather the sample?
The ages of U.S. aircraft have a mean of 13.0 years and a standard deviation of 7.9 years. If the Federal Aviation Administration randomly selects 35 commercial aircraft for special stress tests, find the probability that the mean age of this samp..
For the set of data below construct a grouped frequency distribution that as well contains the real limits of each interval, midpoint of each interval, the cumulative frequency,
The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,10 hours (90 days).
A scatter plot and regression line can be used for all of the following EXCEPT
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