A psychologist wishes to determine whether hypnosis could be used on morbidly obese patients (more than 100 lbs. over ideal weight) to help them lose weight. The hypnosis sessions were conducted by a psychologist-hypnotist once a month for 4 months. The patients' weights were measured at the end of each month for the 4-month period.$\begin{array} { l c c c c }
\hline & \text { Month 1 } & \text { Month 2 } & \text { Month 3 } & \text { Month 4 } \
\hline \text { Patient 1 } & 245 & 225 & 219 & 202 \
\text { Patient 2 } & 340 & 311 & 305 & 284 \
\text { Patient 3 } & 298 & 280 & 277 & 244 \
\text { Patient 4 } & 355 & 328 & 309 & 285 \
\text { Patient 5 } & 321 & 322 & 330 & 325 \
\text { Patient 6 } & 414 & 387 & 375 & 340 \
\text { Patient 7 } & 309 & 285 & 277 & 249 \
\hline
\end{array}$
-The degrees of freedom for SSB are
A)3
B)18
C)24
D)35

Question

A psychologist wishes to determine whether hypnosis could be used on morbidly obese patients (more than 100 lbs. over ideal weight) to help them lose weight. The hypnosis sessions were conducted by a psychologist-hypnotist once a month for 4 months. The patients' weights were measured at the end of each month for the 4-month period.$\begin{array} { l c c c c } 
\hline & \text { Month 1 } & \text { Month 2 } & \text { Month 3 } & \text { Month 4 } \
\hline \text { Patient 1 } & 245 & 225 & 219 & 202 \
\text { Patient 2 } & 340 & 311 & 305 & 284 \
\text { Patient 3 } & 298 & 280 & 277 & 244 \
\text { Patient 4 } & 355 & 328 & 309 & 285 \
\text { Patient 5 } & 321 & 322 & 330 & 325 \
\text { Patient 6 } & 414 & 387 & 375 & 340 \
\text { Patient 7 } & 309 & 285 & 277 & 249 \
\hline
\end{array}$
-The degrees of freedom for SSB are
A)3
B)18
C)24
D)35

Quizplus · Accepted Answer

The degrees of freedom for the Sum of Squares Between groups (SSB) in an ANOVA context are calculated based on the number of groups minus one. Here, the groups are the four months, so the degrees of freedom are $4 - 1 = 3$.

A Psychologist Wishes to Determine Whether Hypnosis Could Be Used