Systolic blood pressure of randomly selected HMO patients was recorded on a particular Wednesday, with the results shown here: $$\begin{array}{l}
\text { Patient Age Group }\
\begin{array} { | c | c | c | c | }
\hline \text { Under } 20 & 20 \text { to } 29 & 30 \text { to } 49 & 50 \text { and Over } \
\hline 105 & 110 & 122 & 139 \
113 & 101 & 114 & 115 \
108 & 112 & 128 & 136 \
114 & 127 & 124 & 124 \
123 & 123 & 125 & 123 \
\hline
\end{array}
\end{array}$$ The appropriate hypothesis test is:
A)one-factor ANOVA.
B)two-factor ANOVA.
C)three-factor ANOVA.
D)four-factor ANOVA.

Question

Systolic blood pressure of randomly selected HMO patients was recorded on a particular Wednesday, with the results shown here: $$\begin{array}{l}
\text { Patient Age Group }\
\begin{array} { | c | c | c | c | } 
\hline \text { Under } 20 & 20 \text { to } 29 & 30 \text { to } 49 & 50 \text { and Over } \
\hline 105 & 110 & 122 & 139 \
113 & 101 & 114 & 115 \
108 & 112 & 128 & 136 \
114 & 127 & 124 & 124 \
123 & 123 & 125 & 123 \
\hline
\end{array}
\end{array}$$ The appropriate hypothesis test is:
A)one-factor ANOVA.
B)two-factor ANOVA.
C)three-factor ANOVA.
D)four-factor ANOVA.

Quizplus · Accepted Answer

One-factor ANOVA is appropriate here because we are comparing the means of systolic blood pressures across different age groups. Two-factor ANOVA would be appropriate if we were comparing the means of systolic blood pressures across different age groups and genders or different age groups and other factors. Three-factor and four-factor ANOVA would be appropriate if we were comparing the means of systolic blood pressures across more than two additional factors.

Systolic Blood Pressure of Randomly Selected HMO Patients Was Recorded