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Question: Performance in online courses. Florida State University information scientists assessed the impact of online courses on student performance (Educational Technology and Society, January 2005). Each in a sample of 24 graduate students enrolled in an online advanced Web application course was asked, ‘‘How many courses per semester (on average) do you take online?'' Each student's performance on weekly quizzes was also recorded. The information scientists found that the number of online courses and weekly quiz grade were negatively correlated at r = -.726.
(a) Give a practical interpretation of r.
(b) The researchers concluded that there is ‘‘significant negative correlation'' between the number of online courses and weekly quiz grade. Do you agree?
What is the probability a random sample of 75 students will provide a sample mean SAT score within 20 of the population mean?
Describe what these boxplots tell you about the relationship between the number of cylinders a car's engine has and the car's fuel economy (mpg):
Write the equation of a first-order model relating mean lead level, E(y), to elevation (x1) and slope face (x2). Include interaction between elevation and slope face in the model.
Explain the meaning of the conditional mean of the dependent variable in the population regression function. Illustrate using an example.
the average score of all golfers for a particular course has a mean of 66 and a standard deviation of 5. suppose 100
question 1 a sample of 2000 licensed drivers revealed the following number of speeding violations.number of
The shop is open every day but Sunday. Assuming day-to-day sales are independent, what's the probability he'll sell over 2000 cups of coffee in a week?
Insurance policy from company A costs $300 a year but guarantees to replace any losses due to theft. Create the decision tree.
Standard deviation of $50. Provide a 95% confidence interval estimate of the variance of the population of the checking accounts.
The following sample of size 12 was taken from a population that is normally distributed and that has a population standard deviation of 12.7:
How many customers must the restaurant have, on the average, to be at least 95 percent sure that the number of customers ordering pie on that day falls in the 19 to 21 percent range?
A test run using the new method resulted in 27 golf carts being assembled in 1.56 hours with a standard deviation of .45. Did the new method result in the golf carts being assembled faster?
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