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Suppose that two dierent tests A and B are to be given to a student chosen at random from a certain population. Suppose also that the mean score on test A is 85. and the standard deviation is 10: the mean score on test B is 90, and the standard deviation is 16: the scores on the two tests have a bivariate normal distribution and the correlation of the two scores is 0.8. If the students score on test A is 80, what is the probability that her score on test B will be higher than 90?
A random sample of 10 observations from one population revealed a sample mean of 23 and a sample deviation of 4. A random sample of 8 observations from another population revealed a sample mean of 26 and a sample standard deviation of 5.
Suppose that the average annual salary for the worker in United States is $39,000.00 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $7,000.00.
the distribution of heights of adult men in the u.s. is approximately normal with mean 69 inches and standard deviation
a government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher
a taiwanese fast food chain wants to introduce its franchises into the western united states 28 different states .
What is the equation for this regression model?
the number of cars that arrive in a certain mechanic shop is a poisson random variable with the parameter ? 1. for k ?
in some states the law requires drivers to turn on their headlights when driving in the rain. a highway patrol officer
For the variable you identify another graphical display that might be useful and construct it. What conclusions can you reach from this other plot that cannot be made from the boxplot?
Use the F test of ANOVA (assume α = 0.05) to decide whether or not there are any differences in true average lumen outputs between the three brands for this type of light bulb.
brees inc. has current assets of 7500 net fixed assets of 28900 current liabilities of 5900 and long-term debt of
What are some typical applications of the Binomial and the Poisson probability distribution? Explain with examples. When is the Hypergeometric distribution used?
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