Consider a Situation in Which Tumor-Prone Rats Were Given an Experimental

question 31

Multiple Choice

Consider a situation in which tumor-prone rats were given an experimental anti-cancer drug or a control. There were 50 rats in each treatment group, and after 6 weeks they were sacrificed and autopsies performed to determine the presence or absence of liver tumors. The table shows the results of the measurements. Which of the mosaic plots shown correctly depicts this data?
?
Contingency table showing presence of tumors in rats with different drug regimes.

$\begin{array}{lll}\text { Present? } & \text { Control } & \text { Drug } \\\hline \text { Yes } & 29 & 25 \\\text { No } & 21 & 25\end{array}$ ?
?

• A) Plot A
• B) Plot B
• C) Plot C
• D) Plot D

---

Definitions:

Factorial Design

A research design used to explore more than one treatment variable.

Fourth Graders

Students who are in the fourth grade of school, typically around 9 or 10 years old.

ANOVA

Analysis of Variance, a statistical method used to compare the means of three or more samples to find differences.

Research Hypothesis

A statement predicting the relationship between variables in a study, opposing the null hypothesis.