A study investigated the effect of a new training method on the obedience of pet parrots. Parrots were first grouped by their type and then randomly assigned to receive either the new training or a traditional training method within each type group. Their obedience was tested and the reseachers analysing the data were not aware of the type of training each parrot received. Use the information about the study to decide if each of the following three statements are TRUE or FALSE. Statement 1 Blocking was not used in this study. Statement 2 Blinding was not used in this study. Statement 3 A control group was used in this study.
Question
A study investigated the effect of a new training method on the obedience of pet parrots. Parrots were first grouped by their type and then randomly assigned to receive either the new training or a traditional training method within each type group. Their obedience was tested and the reseachers analysing the data were not aware of the type of training each parrot received. Use the information about the study to decide if each of the following three statements are TRUE or FALSE.
Statement 1
Blocking was not used in this study.
Statement 2
Blinding was not used in this study.
Statement 3
A control group was used in this study.
Solution
Statement 1: FALSE
The parrots were first grouped by their type before being randomly assigned to receive either the new training or a traditional training method. This is an example of blocking, where subjects are grouped based on a certain characteristic (in this case, type of parrot) before being randomly assigned to different treatments.
Statement 2: FALSE
The researchers analyzing the data were not aware of the type of training each parrot received. This is an example of blinding, where the researchers do not know which treatment each subject received in order to prevent bias in the results.
Statement 3: TRUE
The parrots that received the traditional training method can be considered the control group in this study. A control group is a group that does not receive the experimental treatment and is used as a benchmark to compare the results of the experimental group. In this case, the traditional training method is the standard or benchmark, and the new training method is the experimental treatment.
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