Post by fizzakhan on Sept 18, 2017 16:40:47 GMT
For a bathroom scale to be reliable but not valid would mean that there is something wrong with the scale and the problem consistently affects the number on the scale. For example the scale could show that you are 5 pounds lighter each time you step on it. Though this scale consistently gives you the same number, it is not valid because it is not your actual weight.
-It is not possible to have a scale that is valid but not reliable because when a scale is actually measuring what it is intended to measure ( your real weight) than under the same circumstances it will show you the exact same weight every time you step on it making it reliable.
-It is possible for a lab study to have good internal validity which means that it is accurate in the lab (such as a rat in a skinner box) but not be externally valid in the real world under different and more natural circumstances where the rat would be more distracted.
-An interview and survey can also be more internally valid than externally because the interview and the questions in an interview can sometimes effect how bias the answers of the person being interviewed will be. Sometimes people give answers that they think the interviewer wants to hear etc… A survey can also lack external validity because the person answering the survey might give an answer that is not accurate based on the wording of the question or the way the reader interprets/understands it based on their frame of reference etc…
-It is not possible to have a scale that is valid but not reliable because when a scale is actually measuring what it is intended to measure ( your real weight) than under the same circumstances it will show you the exact same weight every time you step on it making it reliable.
-It is possible for a lab study to have good internal validity which means that it is accurate in the lab (such as a rat in a skinner box) but not be externally valid in the real world under different and more natural circumstances where the rat would be more distracted.
-An interview and survey can also be more internally valid than externally because the interview and the questions in an interview can sometimes effect how bias the answers of the person being interviewed will be. Sometimes people give answers that they think the interviewer wants to hear etc… A survey can also lack external validity because the person answering the survey might give an answer that is not accurate based on the wording of the question or the way the reader interprets/understands it based on their frame of reference etc…