Q. 2 Early on, the most common treatm... [FREE SOLUTION]

91影视

The Practice of Statistics for AP

David Moore,Daren Starnes,Dan Yates

$Math Studyset 91影视 Explanations$ Math

4th Edition 路 809 pages

ISBN: 9781319113339

Chapter 3: Q. 2 (page 158)

Early on, the most common treatment for breast cancer was removal of the breast. It is now usual to remove only the tumor and nearby lymph nodes, followed by radiation. The change in policy was due to a large medical experiment that compared the two treatments. Some breast cancer patients, chosen at random, were given one or the other treatment. The patients were closely followed to see how long they lived following surgery. What are the explanatory and response variables? Are they categorical or quantitative?

Short Answer

Expert verified

The treatment is both explanatory and categorical, and the patient's post-surgical survival is both a reaction and a quantitative variable.

Step by step solution

Concept Introduction

In this problem, there are two variables to consider. The sort of treatment each patient received is the explanatory variable. The response variable would be the length of time each patient lived after surgery.

The explanatory variable can be regarded of as something that aids in the explanation or prediction of the response variable. The influence of the explanatory variable can be described by the response variable.

Explanation

The explanatory variable is a categorical variable because the treatment kind cannot be specified by a number. The response variable is quantitative since the number of years lived following surgery may be quantified given a number.

Quantitative variables have numerical values, but categorical variables place people into one of several classes.