In a Study of the Effectiveness of Physical Exercise in Weight

question 32

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. $\begin{array} { l l l l l l l l l l l l l } \text { Before } & 162 & 190 & 188 & 152 & 148 & 127 & 195 & 164 & 175 & 156 & 180 & 136 \\\hline \text { After } & 157 & 194 & 179 & 149 & 135 & 130 & 183 & 168 & 168 & 148 & 170 & 138 \\\hline\end{array}$

What would be the signed rank for the column with values of 175 and 168 ?

• A) 8
• B) 9
• C) 10
• D) \(8.5\)

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Definitions:

Data

Facts and statistics collected together for reference or analysis.

Linear Regression Equation

An equation used to predict the value of a dependent variable based on one or more independent variables, typically in the form y = mx + b.

Report

A document that presents information compiled systematically for a clear and precise dissemination of information to a specific audience.

Slope

In linear regression, the coefficient that represents the amount of change in the dependent variable for a one-unit change in the independent variable.