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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?
How can concentrated clusters enhance the management of supply chains and improve overall firm performance - how might this management concept vary between international firms and domestic firms?
a distribution with a mean of micro 62 and a standard deviation of s 8 is transformed into a standardized distribution
Home mortgage interest rates for 30-year fixed rate loans vary throughout the country. During the summer 2000, data available from various parts of the country suggested that the standard deviation of the interest rates
Perform exploratory data analysis on all variables in the data set. Realizing that you have six groups, be sure that your exploratory analysis is broken down by group. When possible, include appropriate graphs to help illustrate the dataset.
(a) At the 98% con?dence level, test whether annual income and the amount of life insurance policies are independent. (b) Find the attained signi?cance level. (c) State any assumptions you have made in solving the problem.
Let X1,..., Xn be a random sample from the truncated exponential distribution with pdf re-(x-θ), x ≥ θ
suppose that the weights of cinder blocks at a local construction yard follow a normal distribution with mean of 20 kg
Show the differences between histogram and historigram
Determine the probability that exactly 8 of them started smoking before 18 years of age.
At most, only 30 newspaper ads are possible. For every 106.7 radio ad, there must be at least two 103.1 Radio ads. Formulate the LP model to determine the number of ads in each outlet and maximize the effective audience contact.
Preliminary results indicate that once a golfer has checked in, there is only at 20% chance that he or she will be a no-show. This chance of being a no-show can be modeled using the binomial distribution.
Two points are chosen uniformly and independently on the perimeter of a circle of radius 1. This divides the perimeter into two pieces. Determine the expected value of the length of the shorter piece.
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