There are different approaches to fitness training. To judge which one of two approaches is better, 200 25-year-old men were randomly selected to participate in an experiment. For four weeks, 100 men were trained according to approach 1 while the other 100 men were trained according to approach 2. The percentage improvement in fitness was measured for each man and the statistics shown below were computed. The percentage figures are known to be normally distributed. $$\begin{array} { | c | c | }
\hline \text { Approach 1 } & \text { Approach } 2 \
\hline \bar { x } _ { 1 } = 27.3 & \bar { x } _ { 2 } = 33.6 \
\hline s _ { 1 } ^ { 2 } = 47.614 & s _ { 2 } ^ { 2 } = 28.09 \
\hline
\end{array}$$ Scientists are interested in determining which of the two approaches more consistently improves fitness. Do these results allow us to conclude at the 10% significance level that approach 2 results in a more consistent improvement in fitness than approach 1?

Question

There are different approaches to fitness training. To judge which one of two approaches is better, 200 25-year-old men were randomly selected to participate in an experiment. For four weeks, 100 men were trained according to approach 1 while the other 100 men were trained according to approach 2. The percentage improvement in fitness was measured for each man and the statistics shown below were computed. The percentage figures are known to be normally distributed. $$\begin{array} { | c | c | } 
\hline \text { Approach 1 } & \text { Approach } 2 \
\hline \bar { x } _ { 1 } = 27.3 & \bar { x } _ { 2 } = 33.6 \
\hline s _ { 1 } ^ { 2 } = 47.614 & s _ { 2 } ^ { 2 } = 28.09 \
\hline
\end{array}$$ Scientists are interested in determining which of the two approaches more consistently improves fitness. Do these results allow us to conclude at the 10% significance level that approach 2 results in a more consistent improvement in fitness than approach 1?

Quizplus · Accepted Answer

The Answer of There are different approaches to fitness training. To judge which one of two approaches is better, 200 25-year-old men were randomly selected to participate in an experiment. For four weeks, 100 men were trained according to approach 1 while the other 100 men were trained according to approach 2. The percentage improvement in fitness was measured for each man and the statistics shown below were computed. The percentage figures are known to be normally distributed. $$\begin{array} { | c | c | } 
\hline \text { Approach 1 } & \text { Approach } 2 \
\hline \bar { x } _ { 1 } = 27.3 & \bar { x } _ { 2 } = 33.6 \
\hline s _ { 1 } ^ { 2 } = 47.614 & s _ { 2 } ^ { 2 } = 28.09 \
\hline
\end{array}$$ Scientists are interested in determining which of the two approaches more consistently improves fitness. Do these results allow us to conclude at the 10% significance level that approach 2 results in a more consistent improvement in fitness than approach 1?

There Are Different Approaches to Fitness Training Scientists Are Interested in Determining Which of the Two Approaches