In research methodology, what does the term "double-blind procedure" mean?


Which measure of central tendency is most affected by extreme scores? What is the key difference between content validity and construct validity? In psychological research, what does "external validity" refer to? Which of the following is NOT a characteristic of a good psychological test? Which of the following is an advantage of using a within-subjects design in experiments? What is the difference between correlation and causation? The concept of face validity refers to: What does the term "operational definition" mean in the context of psychological research? Which method is used to estimate the consistency of a psychological test across different occasions? Which of the following techniques is used to control for order effects in a within-subjects design? Which of the following is the most appropriate definition of reliability in psychological measurement? Which of the following is an example of a nominal scale of measurement? A Type I error occurs when: Which type of validity refers to the degree to which a test predicts future performance? In a factor analysis, what is the purpose of "factor rotation"? What is the purpose of random assignment in experimental research? In a normal distribution, what percentage of data falls within one standard deviation of the mean? What does a p-value in hypothesis testing represent? Which statistical test is most appropriate for analyzing the difference between the means of two independent groups? In research methodology, what does the term "double-blind procedure" mean?