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Question: Success in college. Colleges use SAT scores in the admissions process because they believe these scores provide some insight into how a high school student will perform at the college level. Suppose the entering freshmen at a certain college have mean combined SAT Scores of 1833, with a standard deviation of 123. In the first semester these students attained a mean GPA of 2.66, with a standard deviation of 0.56. A scatterplot showed the association to be reasonably linear, and the correlation between SAT score and GPA was 0.47.
a) Write the equation of the regression line.
b) Explain what the y-intercept of the regression line indicates.
c) Interpret the slope of the regression line.
d) Predict the GPA of a freshman who scored a combined 2100.
e) Based upon these statistics, how effective do you think SAT scores would be in predicting academic success during the first semester of the freshman year at this college? Explain.
f) As a student, would you rather have a positive or a negative residual in this context? Explain.
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last year a soft drink manufacturer had 21 of the market. in an effor to increase their portion of the market the
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What is the probability that a typical family will purchase and at least 3 tubes of toothpaste in any given month?
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A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77 (AAII Journal, February 2006).
In the previous exercise, you rejected the hypothesis of equal means. What does this imply about the accuracy of the confidence interval for the difference between the population means based on Student's T?
A function sometimes associated with a continuous nonnegative random variable is the failure rate (or hazard rate) function which is defined as:
acording to the national association of realtors 44 of u.s. homes sold in march 2010 wre purchased by first time home
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A doctor recommends that a patient takes 3 doses of vitamins A or D. a. List out the sample space of the three doses of vitamins, order of the doses matters.
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