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. Calculate the chi-square test statistic χ $$\chi ^ { 2 }$$
to test the claim that walking and low,
Moderate, and high blood pressure are not related. $$\begin{array} { l | c c c }
\text { Blood Pressure } & \text { Low } & \text { Moderate } & \text { High } \
\hline \text { Walkers } & 35 & 62 & 25 \
\text { Non-walkers } & 21 & 65 & 28
\end{array}$$
A)3.473
B)16.183
C)18.112
D)6.003

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. Calculate the chi-square test statistic χ $$\chi ^ { 2 }$$
 to test the claim that walking and low,
Moderate, and high blood pressure are not related. $$\begin{array} { l | c c c } 
\text { Blood Pressure } & \text { Low } & \text { Moderate } & \text { High } \
\hline \text { Walkers } & 35 & 62 & 25 \
\text { Non-walkers } & 21 & 65 & 28
\end{array}$$
A)3.473
B)16.183
C)18.112
D)6.003

Quizplus · Accepted Answer

The chi-square test statistic $\chi^2$ is calculated using the formula $\chi^2 = \sum \frac{(O - E)^2}{E}$, where $O$ represents the observed frequencies and $E$ represents the expected frequencies. To find the expected frequencies, we use the formula $E = \frac{(row\ total \times column\ total)}{grand\ total}$. After calculating the expected frequencies for each cell and applying them in the formula, the result is approximately 3.473, indicating that choice A is correct.

A Medical Researcher Is Interested in Determining If There Is χ2\chi ^ { 2 }χ2

A Medical Researcher Is Interested in Determining If There Is $\chi ^ { 2 }$