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123123456 123123456
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Posts: 619
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6 years ago
Classical psychophysicists placed a great deal of emphasis on determining the absolute threshold for a particular type of sensory stimulation. This proved to be difficult because
 
  a. the point at which an observer detects a stimulus varies from trial to trial.
  b. adequate technical equipment for measuring intensity was not available until recently.
  c. subjects must be carefully trained to make these judgments accurately.
  d. researchers used samples too small to give reliable results.



A matched-subjects design attempts to eliminate the problems associated with ____ that are a concern for between-subjects designs and also eliminate the problems associated with ____ that are a concern for within-subjects designs.
 
  a. order effects; order effects
 b. order effects; individual differences
 c. individual differences; individual differences
  d. individual differences; order effects



When the Method of Equal-Appearing Intervals is used, one of the criteria for the inclusion of an item in the final scale is based on ____.
 
  a. the items statistical independence from the other questions
  b. the size of the interquartile range of expert raters
  c. whether the item as rated by experts has a high correlation with the total score across items
  d. the lowest variability across judges



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?
 
  a. absolute threshold
  b. perceptual defense
  c. method of limits
  d. difference threshold



For an experiment that compares two treatment conditions with ten scores in each treatment, which design would require the smallest number of participants?
 
  a. between participants
 b. within participants
 c. matched subjects
 d. all designs would require the same number of participants



When the Method of Equal-Appearing Intervals is used, experts rate the favorability of potential items on a scale of 1 to ____.
 
  a. 5
  b. 7
  c. 9
  d. 11



Which of the following is an acceptable operational definition for an auditory threshold?
 
  a. The lowest intensity of a sound, as measured in decibels, at which a participant always reports hearing the sound
 b. The lowest intensity of a sound, as measured in decibels, at which every participant in an experiment reports hearing the sound
 c. The lowest intensity of a sound, as measured in decibels, at which a participant reports hearing the sound 50 of the time
 d. The lowest intensity of a sound, as measured in decibels, at which 50 of the participants report hearing the sound.



Within-subjects designs are most useful when individual differences are ____.
 
  a. large and there are many participants available
 b. large and there are relatively few participants available
  c. small and there are many participants available
 d. small and there are relatively few participants available



The Method of Equal-Appearing Intervals is a(n) ____ scaling method.
 
  a. univariate
  b. unidimensional
  c. multivariate
  d. multidimensional



An experimenter presents a subject with a series of tones. During each trial of the experiment, the experimenter signals the start of the trial by saying ready, plays the tone, and then asks whether the subject heard it. The experiment begins with a fairly loud, clearly audible tone; on each subsequent trial, the loudness of the tone is reduced at a constant rate of 10 decibels until the subject does not hear the tone. The experimenter then starts a second series of trials with a tone too low to be heard and increases the volume gradually until the subject reports hearing the tone. What is the experimenter trying to measure?
 
  a. absolute threshold
  b. perceptual defense
  c. method of limits
  d. difference threshold
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JodiLoveJodiLove
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Posts: 785
6 years ago
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123123456 Author
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6 years ago
Easily the best answer, TY and have a wonderful day
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