Systolic blood pressure of randomly selected HMO patients was recorded on a particular Wednesday, with the results shown here. An ANOVA test was performed using these data. $$\begin{array}{l}
\text { Patient Age Group }\
\begin{array} { | c | c | c | c | }
\hline \text { Under 20 } & \text { 20 to } 29 & 30 \text { to } 49 & \text { 50 and Over } \
\hline 105 & 110 & 122 & 139 \
113 & 101 & 114 & 115 \
108 & 112 & 128 & 136 \
114 & 127 & 124 & 124 \
123 & 123 & 125 & 123 \
\hline
\end{array}
\end{array}$$ What are the degrees of freedom for the error sum of squares?
A)3
B)19
C)16
D)It depends on ?.

Question

Systolic blood pressure of randomly selected HMO patients was recorded on a particular Wednesday, with the results shown here. An ANOVA test was performed using these data. $$\begin{array}{l}
\text { Patient Age Group }\
\begin{array} { | c | c | c | c | } 
\hline \text { Under 20 } & \text { 20 to } 29 & 30 \text { to } 49 & \text { 50 and Over } \
\hline 105 & 110 & 122 & 139 \
113 & 101 & 114 & 115 \
108 & 112 & 128 & 136 \
114 & 127 & 124 & 124 \
123 & 123 & 125 & 123 \
\hline
\end{array}
\end{array}$$ What are the degrees of freedom for the error sum of squares?
A)3
B)19
C)16
D)It depends on ?.

Quizplus · Accepted Answer

The degrees of freedom for the error sum of squares is calculated as follows:

df error = (total number of observations) - (total number of groups)
df error = (5 * 4) - 4
df error = 16

Therefore, the correct choice is C.

Systolic Blood Pressure of Randomly Selected HMO Patients Was Recorded