Which of the following is a disadvantage of the group administered questionnaire?

Which of the following is a disadvantage of the group administered questionnaire?
 
  a. low return rate
  b. cannot be used if individual participants are spread out across locations
  c. expensive and time consuming
  d. time consuming

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Dermo-optical perception is a pseudoscience.
 
  Indicate whether the statement is true or false

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The least informative measure of central tendency is the
 
  a. mode.
  b. median.
  c. range.
  d. variance.

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The mean, median, and mode are all considered to be measures of
 
  a. inferential statistics.
  b. effect size.
  c. variability.
  d. central tendency.

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Dermo-optical perception is a specialty area of psychology.
 
  Indicate whether the statement is true or false