Data Set 10-4: Gerbils were used to assess the effect of Natural Neutral, a drug designed to reduce emotionality in high-drive people. Each of 20 gerbils spent 10 solitary minutes in an open field. The investigator recorded the number of fecal boluses for each animal. Then each animal was given an injection of Natural Neutral and the open field task was repeated. The following data were produced (large numbers indicate high emotionality).
$$\begin{array} { l l l }
& \text { No Drug } & \text { Drug } \
\text { mean number of boluses } & 6 & 8 \
\text { standard deviation of boluses } & 2 & 2 \
\end{array}$$
$\text { correlation coefficient between Drug and No Drug Score } = .50$
-The design in Data Set 10-4 is one of
A) paired samples
B) independent samples
C) testing the significance of a correlation
D) none of the other alternatives are correct.

Question

Data Set 10-4: Gerbils were used to assess the effect of Natural Neutral, a drug designed to reduce emotionality in high-drive people. Each of 20 gerbils spent 10 solitary minutes in an open field. The investigator recorded the number of fecal boluses for each animal. Then each animal was given an injection of Natural Neutral and the open field task was repeated. The following data were produced (large numbers indicate high emotionality).
 $$\begin{array} { l l l } 
& \text { No Drug } & \text { Drug } \
 \text { mean number of boluses } & 6 & 8 \
\text { standard deviation of boluses } & 2 & 2 \
\end{array}$$
$\text { correlation coefficient between Drug and No Drug Score } = .50$
-The design in Data Set 10-4 is one of
A) paired samples
B) independent samples
C) testing the significance of a correlation
D) none of the other alternatives are correct.

Quizplus · Accepted Answer

The design involves comparing the same group of gerbils before and after treatment with Natural Neutral, which is characteristic of a paired samples design.

Data Set 10-4: Gerbils Were Used to Assess the Effect