A medical researcher is interested in determining if there is a relationship between adults over 50 who walk regularly and low, moderate, and high blood pressure. A random sample of 236 adults over 50 is selected and
The results are given below. Find the critical value χ $$\chi _ { 0 } ^ { 2 }$$
to test the claim that walking and low, moderate, and
High blood pressure are not related. Use $$\alpha$$ = 0.01. $$\begin{array} { l | c c c }
\text { Blood Pressure } & \text { Low } & \text { Moderate } & \text { High } \
\hline \text { Walkers } & 35 & 62 & 25 \
\text { Non-walkers } & 21 & 65 & 28
\end{array}$$
A)9.210
B)9.348
C)6.251
D)0.584

Question

A medical researcher is interested in determining if there is a relationship between adults over 50 who walk regularly and low, moderate, and high blood pressure. A random sample of 236 adults over 50 is selected and
The results are given below. Find the critical value χ $$\chi _ { 0 } ^ { 2 }$$
 to test the claim that walking and low, moderate, and
High blood pressure are not related. Use $$\alpha$$ = 0.01. $$\begin{array} { l | c c c } 
\text { Blood Pressure } & \text { Low } & \text { Moderate } & \text { High } \
\hline \text { Walkers } & 35 & 62 & 25 \
\text { Non-walkers } & 21 & 65 & 28
\end{array}$$
A)9.210
B)9.348
C)6.251
D)0.584

Quizplus · Accepted Answer

The degrees of freedom for this test are (rows - 1) * (columns - 1) = (2-1)*(3-1) = 2. Using a chi-square distribution table with 2 degrees of freedom and $$\alpha$$ = 0.01, the critical value is 9.210.

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