- \r\n\t
- The group that receives the treatment is commonly called the experimental group<\/strong>.<\/li>\r\n\t
- The group that does not receive the treatment is usually called the control group<\/strong>.<\/li>\r\n<\/ul>\r\n
The control group is usually kept under conditions that are considered typical or common for a given situation.<\/p>\r\n\r\n[caption id=\"attachment_6127\" align=\"alignnone\" width=\"898\"]
![\"](\"https:\/\/content-cdn.one.lumenlearning.com\/wp-content\/uploads\/sites\/27\/2023\/03\/11152113\/2.3LDiagram2.png\")
Figure 1. Random assignment helps ensure that the only difference between the control and experimental groups is the treatment being tested.[\/caption]\r\n\r\nIt is important to remember that the only difference between the experimental and control groups is the researcher\u2019s manipulation of the factor of interest.<\/p>\r\n
[ohm2_question hide_question_numbers=1]698[\/ohm2_question]<\/section>\r\n The primary goal of an\u00a0experiment<\/strong> is to provide evidence for a cause-and-effect relationship between two variables. In contrast, an observational study<\/strong> observes individuals and measures variables of interest. We conduct observational studies to investigate questions about a population or an association between two variables. However, an observational study alone does not provide convincing evidence of a cause-and-effect relationship.<\/section>\r\n [ohm2_question hide_question_numbers=1]3258[\/ohm2_question]<\/section>\r\n [ohm2_question hide_question_numbers=1]3259[\/ohm2_question]<\/section>","rendered":" Experimental and Control Groups<\/h2>\n
An important aspect of all experiments is a comparison between one or more groups or levels<\/b> of the factor of interest. These comparisons are called treatments<\/b>. In a simple experimental design, one group receives the researcher\u2019s treatment and the other group(s) does not.<\/p>\n
- \n
- The group that receives the treatment is commonly called the experimental group<\/strong>.<\/li>\n
- The group that does not receive the treatment is usually called the control group<\/strong>.<\/li>\n<\/ul>\n
The control group is usually kept under conditions that are considered typical or common for a given situation.<\/p>\n
Figure 1. Random assignment helps ensure that the only difference between the control and experimental groups is the treatment being tested.<\/figcaption><\/figure>\n It is important to remember that the only difference between the experimental and control groups is the researcher\u2019s manipulation of the factor of interest.<\/p>\n
- The group that does not receive the treatment is usually called the control group<\/strong>.<\/li>\n<\/ul>\n
- The group that does not receive the treatment is usually called the control group<\/strong>.<\/li>\r\n<\/ul>\r\n