SCENARIO 15-8
Recently, a University Switched to a New Type

question 237

Short Answer

SCENARIO 15-8
Recently, a university switched to a new type of computer-based registration.The registrar is concerned with the amount of time (hours) students are spending on the computer registering under the new system.She decides to randomly select 8 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. $\begin{array}{cccc}\underline{\text { Day }} & \underline{\text { Range}}& \underline{\text { Mean }}& \underline{\text { Std.Dev. }}\\1 & 10 & 5.250 & 3.4949 \\2 & 31 & 15.250 & 10.3060 \\3 & 13 & 20.375 & 4.9262 \\4 & 21 & 22.875 & 8.3911 \\5 & 35 & 8.500 & 11.3767 \\6 & 18 & 7.875 & 6.9372 \\7 & 25 & 11.250 & 8.5815 \\8 & 30 & 7.875 & 9.5235 \\9 & 17 & 10.250 & 6.3640 \\10 & 22 & 9.500 & 7.8740 \\11 & 27 & 7.875 & 8.7086 \\12 & 26 & 12.875 & 9.3723\end{array}$

-Referring to SCENARIO 15-8, an X chart is to be used for the time required to register.The center line of this chart is located at .

---

Definitions:

Ferns

Ferns are non-flowering vascular plants that reproduce via spores and have fronds, belonging to a group called Pteridophyta.

Amphibians

Cold-blooded vertebrates that can live both in water (using gills to breathe) and on land (breathing with lungs) at different stages of their life.

Prebiotic Soup Hypothesis

A theory suggesting that life on Earth began in a "soup" of organic molecules, possibly in the oceans, facilitated by energy from sunlight or geothermal sources.

Fossil Record

The accumulation of evidence in rock layers about the history of life on Earth, including the remains or imprints of organisms from past geologic ages.