SCENARIO 11-13
an Important Factor in Selecting Database Software Is

question 103

Short Answer

SCENARIO 11-13
An important factor in selecting database software is the time required for a user to learn how to use
the system. To evaluate three potential brands (A, B and C) of database software, a company
designed a test involving five different employees. To reduce variability due to differences among
employees, each of the five employees is trained on each of the three different brands. The amount of
time (in hours) needed to learn each of the three different brands is given below: $\begin{array}{ | r | r | r | r | } \hline & & \text { Software } & \\\hline \text { Operator } & \text { A } & \text { B } & \text { C } \\\hline 1 & 17 & 17 & 23 \\\hline 2 & 18 & 17 & 23 \\\hline 3 & 14 & 13 & 19 \\\hline 4 & 12 & 11 & 18 \\\hline 5 & 19 & 17 & 22 \\\hline \text { Mean } & 16 & 15 & 21 \\\hline\end{array}$

$\text { Below is the Excel output for the randomized block design: }$
$\begin{array}{lrrrrrr}\hline \text { Source of Variation } & S S & d f & \text { MS } & {\text { F }} & \text { P-value } & \text { Fcrit } \\\hline \text { Rows } & 84.66667 & 4 & 21.16667 & 50.8 & 9.98 \mathrm{E}-06 & 3.837853 \\\text { Columns } & 103.3333 & 2 & 51.66667 & 124 & 9.54 \mathrm{E}-07 & 4.45897 \\\text { Error } & 3.333333 & 8 & 0.416667 & & & \\\text { Total } & 191.3333 & 14 & & & & \\\hline\end{array}$
-Referring to Scenario 11-13, what is the null hypothesis for testing the block effects? a) $H _ { 0 } : \mu _ { A } = \mu _ { B } = \mu _ { C }$
b) $H _ { 0 } : \mu _ { 1 } = \mu _ { 2 } = \mu _ { 3 } = \mu _ { 4 } = \mu _ { 5 }$
c) $H _ { 0 } : M _ { A } = M _ { B } = M _ { C }$
d) $H _ { 0 } : M _ { 1 } = M _ { 2 } = M _ { 3 } = M _ { 4 } = M _ { 5 }$

---

Definitions:

Real Wage

The purchasing power of wages, taking into account the effect of inflation on purchasing power.

Nominal Wage

The wage paid to employees in current dollars without adjustment for inflation, reflecting the actual amount of money received.

General Price Level

An index that shows the average price of goods and services across the economy over a period of time.

Real Wages

Wages adjusted for inflation, reflecting the purchasing power of income earned from work.