The correct answer is double- blind experiment to minimize research participate bias and researcher bias
Double-blind Experiment is a method of clinical trial carried out on human beings where neither the examine nor the examiner knows what is being used as a variable at any given time. It is commonly used as a criterion for validating quantitative experimental practices in science.
Without this intellectual tool, it would be very difficult to carry out any scientific tests involving human beings with confidence. The purpose of the double-blind test is to avoid any conscious or unconscious interference with the results of an experiment.
The amount of time a student spent studying for an exam is a quantitative variable because it can be expressed numerically such as 4 hours, and 80 minutes, among other units of time measurement.
Any variable where the data indicate amounts is referred to be a quantitative variable (e.g. height, weight, or age). Any variable where the data represent groupings is referred to as a categorical variable. This comprises categories (like were people placed in a race), rankings (like cereal brands), and binary results (e.g. coin flips).
Variables assessed on a numeric scale are known as quantitative variables, as was covered in the chapter's section on variables. Examples of quantitative variables are height, weight, reaction time, subjective pain rating, temperature, and exam score.
Learn more about variables here:
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Answer:
those animals which have backbone are called vertibrates
