Refer to the Mega-Stat/Excel Output for the Wilcoxon Rank Sum $\text { Wilcoxon - Mann/Whitney Test }$

question 28

Multiple Choice

Refer to the Mega-Stat/Excel output for the Wilcoxon rank sum test given in the table below.
$\text { Wilcoxon - Mann/Whitney Test }$
$\begin{array} { l }\quad2\quad\quad\text { sum of ranks }\\\begin{array}{|c|c|}\hline 10\quad\quad \quad& 66.5\quad \\\hline 10 & 143.5 \\\hline \end{array}&\begin{array} { l }\text { Group } 1\\\text { Group } 2\\\end{array}\\\quad 20\quad\quad\quad\quad210&\text { total }\\\end{array}$

105.00 $\quad$ expected value
13.07 $\quad$ standard deviation
$-2.91\quad \mathrm{z}$ , corrected for ties
$.0018\quad \mathrm{p}$ -value (two-
tailed)
-At a significance level of .05,which one of the following rejection point conditions is correct when the alternative hypothesis is H_a: D₁ is shifted to the left of D₂?

• A)Reject H₀ if T ? 83.
• B)Reject H₀ if T ? 127
• C)Reject H₀ if T ? 131
• D)Reject H₀ if T ? 83
• E)Reject H₀ if T ? 79

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Definitions:

Short Run

A period in which at least one input, such as plant size or capital, is fixed and cannot be varied to change output levels.

Long Run

A time frame in economics where all inputs and costs are variable, allowing for full adjustment to changes.

Peak Efficiency

The maximum performance level at which a system, process, or machine operates with optimal effectiveness and minimal waste.

Break-Even Point

The level of production or the volume of sales at which total costs equal total revenue, meaning there is no profit or loss.