Chapter 11.2, Problem 61E

To determine

To explain: the study is related to observational study or experimental study.

Answer to Problem 61E

The study is the experimental study.

Explanation of Solution

Given information:

The data is given below as,

  

Observational study:

If the individuals under the study are just observed and measured based on certain characteristics without modifying them then the study is termed as observational study.

Experimental Study:

If some treatments are applied on the individuals in order to observe the effectiveness of the treatments then the study is termed as experimental study.

A study is conducted to determine whether answers of the respondents are being affected if the rating scale is changed or not. For this a simple random sample of 90 students are selected from the total population of 1:000 students. The first 45 students are given the scale of l to 5 and the remaining 45 students are given scale of 0 to 4.

In this study: the different scaling is given to two groups of students for observing the effect of scale on the responses to the question. This shows that: the study is an experiment.

Thus, the study is experimental study.