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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?
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
Random variables x and y have the joint density function. Find the value of the constant a
Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from knowledge of the standard deviation?
business needs to be at least $8 million dollars in annual sales before expansion could be considered. The following is data for the past 6 years. What should the owner's decision be regarding expansion in 2010?
the following data summarizes the historical demand for a productmonthnbspnbspnbspnbsp actual
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis? What might happen if we do not use this p-value in particular, when we are rejecting a Null hypothesis?
The City Transit Authority plans to hire 8 new bus drivers. From the group of 100 qualified applicants, of whom 55 are men and 45 are women, 8 names are to be selected by lot. Suppose that Mary and John Lewis are among the 100 qualified applicants..
Construct four questions, each question reflecting one of the four corresponding levels of measurement, that a mortgagor (borrower) would answer relevant to their home mortgage.
suppose a geyser has a mean time betwen eruptions of 83 minutes. let the interval of time between the erupitons be
At the 5% level of significance, is there evidence of a difference among the mean access read times for the three files sizes?
Do you agree that if two events are mutually exclusive then these two events will be independent and provide one business-related example each, with explanation, for mutually exclusive and independent events
A small town has a population of 20,000 people. Among these, 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
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