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Question: Back to campus again. In 2004 ACT, Inc., reported that 74% of 1644 randomly selected college freshmen returned to college the next year. The study was stratified by type of college-public or private. The retention rates were 71.9% among 505 students enrolled in public colleges and 74.9% among 1139 students enrolled in private colleges.
a) Will the 95% confidence interval for the true national retention rate in private colleges be wider or narrower than the 95% confidence interval for the retention rate in public colleges? Explain.
b) Do you expect the margin of error for the overall retention rate to be larger or smaller? Explain.
the data below are the ages and systolic blood pressure measured in millimeters of mercury of 9 randomly selected
Compute the mean and variance of the following discrete probability distribution.
Regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6. At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
the discrete random variable x is the number of students that show up for professor smiths office hours on monday
The data given below represent the annual gross revenue (N'millions) obtained by a telephone company over the periods 1987 - 1996:
Develop a multiple regression model in which your dependent variable is explained by several independent variables.
The mean number of flaws per 100 m of material produced on a certain machine at Blanktown Fabrics is 2. If flaws occur randomly, find the probability that in 50 m of material there will be less than 2 flaws.
Find the probability that a double six comes up at least once when a pair of dice is rolled 24 times. Answer the query the Chevalier de Méré.
On a graph, the vertical difference between the observed and predicted values of the response variable for an individual is called the
What is the average monthly amount charge? What percent of monthly charges are between $600 and $ $889 What percent of monthly charges is less than $100.
How can the manager of a ?rm producing lightbulbs summarize and describe to a board meeting the results of testing the life of a sample of 100 lightbulbs produced by the ?rm?
Let M(t) be a wide sense stationary random process with average power E[M2(t)] = q and power spectral density SM ( f ). The Hilbert transform of M(t) is (t), a signal obtained by passing M(t) through a linear time-invariant filter with frequency resp..
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