A mobile computer network consists of a number of computers (called nodes) that communicate with each other while moving throughout a region. A node that is out of transmission range of the other nodes, so that it is unable to communicate, is said to be partitioned. In studies carried out at the Colorado School of Mines, S. Kurkowski found that in a network containing 185 nodes in which destinations were chosen at random from a uniform distribution, 19 nodes were partitioned. J. Norman found that in a network containing 164 nodes whose movements mimicked those on a college campus, 30 nodes were partitioned. Find a 99% confidence interval for the difference between the proportions of partitioned nodes in the two networks.
2/29/2016 Hwk2 (Chapters 5-7) Submitted by PATEL, RAHIL (RSP5196) on 2/5/2016 9:32:25 PM Points Awarded 40.00 Points Missed 80.00 Percentage 33.3% 1. Which one of the following is NOT true about the motivation and scope of data communications A) information sources can be of arbitrary types B) information can be transmitted at an arbitrary speed C) transmission uses a physical system D) multiple information sources can share the underlying medium Points Earned: 10.0/10.0 Correct Answer(s): B 2. Which one of the following is NOT true about digital signals A) a digital signal has a fixed set of valid levels B) each level change consists of an instantaneous move from one valid level to another C) a digital signal has infinite bandwidth D) the entire computer network can only use digital signals because data are represented by binary numbers in computers Points Earned: 0.0/10.0 Correct Answer(s): D 3. If a data communication system uses 8 levels of voltage to represent data, how many data bits can each level represent (Figure 6.8 (a) and (b)) A) 1 bits B) 2 bits C) 3 bits D) 4 bits
