Three of these are wrong. Find the one that holds.

Exercise and reference answers

Questions

1. Question

   Three of these statements about range are false.

   Choices

   1. Item

      Maximum value minus minimum value

      Correct

      Yes

   2. Explanation

      Only the two extreme values enter it.

      Item

      It uses every observation

   3. Explanation

      It says nothing about a central tendency.

      Item

      It measures spread about the mean

   4. Explanation

      It is a measure of dispersion.

      Item

      It is a measure of central tendency

2. Question

   Three of these statements about variance are false.

   Choices

   1. Item

      It averages squared deviations

      Correct

      Yes

   2. Explanation

      Squares are never negative.

      Item

      It can be negative

   3. Explanation

      It is the other way round.

      Item

      It is the root of the standard deviation

   4. Explanation

      That describes mean deviation instead.

      Item

      It averages absolute deviations

Explanation