This Question: 1 pt 7 of 11 (5 This Quiz: pes Fity mice that are susceptible to

Question

This Question: 1 pt 7 of 11 (5 This Quiz: pes Fity mice that are susceptible to cancer are randomly divided into two groups. One group is treated daily with radason simia that generated by cel phones Tha other group receiwrane radaton Ater sou both tested for cancer. a. Identity the response variable and the e variable, observational study experiment? Explain why lb. Was thes an v and the explanatory variable is a. The response variable is b Choose the correct description of the study O A The study is an experiment because the researchers cannot control the response variable ahar 1 year O B. The sady an observational study because the researchers only observe values of the response and explanatory variables O c. The study is an experiment becau the research wssignsubjects to certain expo mental conditors and observe the outcomes on the response waviek O D. The study an observational study because the researchers cannot com the response variable ater 1year

Explanation / Answer

The response variable is the focus of a question in a study or experiment. An explanatory variable is one that explains changes in that variable. It can be anything that might affect the response variable.

Based on this definition answer to part a is

a. Daily treatment is explanatory variable.

Efffect of treatment on mice is response variable.

b. The researcher has no control over the variables in an observational study. An experiment is a method of applying treatments to a group and recording the effects. Remember, a good group experiment will have two basic elements: a control and a treatment.

Hence answer is c as the study is experiment because the researchers asssign subjects to certain expiremental conditions and observe the outcomes on the response variable.

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