An experimenter presents a subject with a standard weight of 100 grams followed by a comparison weight of 20 grams; the subject is asked if the two weights are the same or different. The standard is repeated followed by a comparison weight of 30 grams; the subject is again asked if the two are the same or different. This procedure continues with a comparison weight 10 grams heavier on each presentation until the subject says that both weights are the same. These steps are repeated starting with a comparison weight of 190 grams and decreasing it by 10 grams on each trial until the subject says the two weights are the same. What is the experimenter trying to measure?Question 10Answera.perceptual defenseb.difference thresholdc.method of limitsd.absolute threshold

Why do we do multiple trials of the same experiment under the same conditions using the same test subject?

Match the following word pairs concerning when you would use which balance and what technique (addition or difference) is required.Group of answer choicesWeighing 15.0 g accurately (but as quickly as possible)Weighing 0.01 g accuratelySmall losses in mass would have large effects on experimental resultsSmall losses in mass would not have large effects on experimental results (and speed is required)

Which of the following best describes a research study that randomly assigns people to different conditions and carefully controls all the other circumstances so that they will be equivalent across the two conditions?experimentcorrelationsurveyobservation

A scientist investigating Weber’s law detects a just-noticeable difference for a subject when shifting from a 5 kg to an 8 kg mass. When repeating the trial, how many kilograms must be added to a 15 kg mass to replicate the effect? A.6 kgB.9 kgC.18 kgD.24 kg

Drag and drop the words or phrases that accurately complete the summary.When a scientist designs an experiment to find the answer to a question, they follow certain scientific to ensure the results are .One of these is to perform multiple trials in their experiment to help eliminate the effects of random occurrences. This is referred to as .Another scientist may read about the experiment and decide to reproduce it to see if they get the same results. This is an example of . If the second scientist gets the same or similar results, this adds even more reliability to the first scientist's investigation.replicationstandardsreliablereportscientistresultrocketrepetition