In a Study of the Effectiveness of Physical Exercise in Weight

question 78

Multiple Choice

In a study of the effectiveness of physical exercise in weight reduction, 12 subjects followed a program of physical exercise for two months. Their weights (in pounds) before and after this program are shown in the
Table. Use Wilcoxon's signed-ranks test and a significance level of 0.05 to test the claim that the exercise
Program has no effect on weight. $$\begin{array} { | l l l l l l l l l l l l l | } \hline \text { Before } & 162 & 190 & 188 & 152 & 148 & 127 & 195 & 164 & 175 & 156 & 180 & 136 \\\hline \text { After } & 157 & 194 & 179 & 149 & 135 & 130 & 183 & 168 & 168 & 148 & 170 & 138 \\\hline\end{array}$$ What would be the signed rank for the column with values of 175 and 168?

• A) 10
• B) 8.5
• C) 9
• D) 8

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Definitions:

Buyers

Buyers are individuals or entities that purchase goods or services from sellers in exchange for money or other considerations.

Sellers

Parties that provide products or services available for purchase in the market.

Mutual Interdependence

A situation in which the actions of one firm significantly affect the outcomes of other firms in the market, commonly seen in oligopolistic industries.

Perfectly Inelastic Demand

A situation where the quantity demanded does not change in response to changes in price.