Instruction 18-12
Recently,a University Switched to a New Type of Computer-Based

Instruction 18-12
Recently,a university switched to a new type of computer-based registration.The registrar is concerned with the amount of time students are spending on the computer registering under the new system.She decides to randomly select eight students on each of the 12 days of the registration and determine the time each spends on the computer registering.The range,mean,and standard deviation of the times required to register are in the table that follows.
$\begin{array}{rrrr}\text { Day } & \text { Range } & \text { Mean } & \text { Std.Dev. } \\\hline { 1 - 3 } & 10 & 5.250 & 3.4949 \\2 & 31 & 15.250 & 10.3060 \\3 & 13 & 20.375 & 4.9262 \\4 & 21 & 22875 & 8.3911 \\5 & 35 & 8.500 & 11.3767 \\6 & 18 & 7.875 & 6.9372 \\7 & 25 & 11.250 & 8.5815 \\8 & 30 & 7.875 & 9.5235 \\9 & 17 & 10.250 & 6.3640 \\10 & 22 & 9.500 & 7.8740\\11 & 27 & 7.875 & 8.7086 \\12 & 26 & 12875 & 9.3723\\\end{array}$
-Referring to Instruction 18-12,based on the R chart,it appears that the process is out of control.