Instruction 18-14
Recently,a University Switched to a New Type of Computer-Based

question 69

Short Answer

Instruction 18-14
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.
$\begin{array}{rrrr} \text { Day }& \text { Range}& \text { Mean }& \text { Std.Dev.}\\\hline1 & 10 & 5.250 & 3.4949 \\2 & 31 & 15.250 & 10.3060 \\3 & 13 & 20.375 & 4.9262 \\4 & 21 & 22875 & 8.3911 \\5 & 35 & 8.500 & 11.3767 \\6 & 18 & 7.875 & 6.9372 \\7 & 25 & 11.250 & 8.5815 \\8 & 30 & 7.875 & 9.5235 \\9 & 17 & 10.250 & 6.3640 \\10 & 22 & 9.500 & 7.8740 \\11 & 27 & 7.875 & 8.7086 \\12 & 26 & 12875 & 9.3723\end{array}$
-Referring to Instruction 18-14,an R chart is to be constructed for the time required to register.One way to create the lower control limit involves multiplying the mean of the sample ranges by D₃.For this data set,the value of D₃ is ________.

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Definitions:

Symbiotic Relationship

A close and long-term biological interaction between two different biological organisms, which can be mutualistic, commensalistic, or parasitic.

Natural State

Often refers to the condition of human beings and society before the establishment of formal laws and social structures, suggesting an innate nature of existence.

Tabula Rasa

A theory that individuals are born without built-in mental content, and therefore all knowledge comes from experience or perception.

Blank Slate

The theory that individuals are born without built-in mental content, and all knowledge comes from experience or perception.