Knock out the z-score myths

Exercise and reference answers

Questions

1. Question

   Three of these statements about z-scores are false.

   Choices

   1. Explanation

      A z-score of 0 puts the value exactly at the mean.

      Item

      A z-score of 0 means a failing score

   2. Item

      A negative z-score sits below the mean

      Correct

      Yes

   3. Explanation

      A z-score counts standard deviations, not a share of people.

      Item

      A z of 0.7 means the 70th percentile

   4. Explanation

      Each test has its own mean and spread, so raw size is not enough.

      Item

      A bigger raw score gives a bigger z

Instructions

Tap the three false claims to knock them out and leave the one claim that survives.

Explanation