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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?
The heights of 18 year old men are approximately normally distributed with mean 68 inches and a SD of 3 inches.
a bookshelf contains 20 textbooks for different subjects. among those 10 of them are used ones and 10 of them are brand
explain the general rationale behind using a z-score for describing how an individual performed on an exam compared to
Components shipped include 0.5% defectives. You plan to select 80 items; if 0 are defective, you will assume all are okay.
STA101 - Statistics for Business. A basketball player has the following points for seven games: 20, 25, 32, 18, 19, 22, and 30. Compute the following measures: a) Compute the sample mean (the average of the points of each game) Compute the variance a..
usfec rents the flatbed trailers on which the organizations participating in the parade build their floats. the
a. If the campaign manager's claim is correct, what is the probability that the sample proportion would be no more than 0.49 for a sample of this size? b. Based on your answer to part (a), speculate on whether the campaign manager's claim might be ..
If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.
in an effort to improve the vocabulary of 10 students a teacher provides a weekly 1-hour tutoring session for them. a
The accompanying data on degree of spirituality for samples of natural and social scientists at research universities as well as for a sample of non-academics with graduate degrees appeared in the article "Conflict Between Religion and Science Amo..
the cost of a college education has increased at a much faster rate than costs in general over the past twenty years.
a well-insulated rigid tank of volume 10 ft3 contains carbon dioxide initially at 30 psia and 60 degrees f. the tank is
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