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Professor Friedman's economics course the correlation between the students' total scores prior to the final examination and their final-examination scores is r = 0.61. The pre-exam totals for all students in the course have mean 270 and standard deviation 29. The final-exam scores have mean 73 and standard deviation 9. Professor Friedman has lost Julie's final exam but knows that her total before the exam was 295. He decides to predict her final-exam score from her pre-exam total.(a) What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course? (Use 2 decimal places.)
The Absent Minded Professor study was a RCT, which had an objective to estimate the protective effect of drug "No-Reminder" compared to drug "Reminder" on risk of "Forgetful syndrome". The study found that the drug "No-Reminder" was protective.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
One environmental group did a study of recycling habits in a California community. It found that 73% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
If a single test is run and indicates that oil is present, what is the revised probability that oil is actually present?
Determine the Midrange. Determine the Standard Variance. Determine the Standard Deviation
The average gasoline price of one of the major oil companies has been $2,25 per gallon. Recently, the company has undertaken several efficiency measures in order to reduce prices. Management is interested in determing whether their efficiency meas..
test null hypothesis: Meu=80 against alternative hpothesis=negative = 80 (alpha =.05). What does this tell you about meu?
Can you explain to me how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same. Please provide a numerical example:
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution. Use a =.05 and .01 and perform a goodness of fit test.
Q2 is dummy variable equal to 1 in second quarter and 0 otherwise; and Q3 is final dummy variable equal to 1 in third quarter and 0 otherwise. Determine the Base Quarter?
Let (X,Y) have uniform distribution on the four points (-1,0), (0,1), (0,-1), (1,0). Show that X and Y are uncorrelated but not independent.
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