math-roskdale

Create standardized scores for all scale variables (price through alcohol). Which beverages have positive standardized scores on every variable? What does this mean?

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1. Scale lacking.

The Z score is the raw score in terms standard deviations (SD). It is one type of standard score, cutting off the same percentages for any normal distribution.

Z = (score-mean)/SD

Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to any Z score.

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posted by PsyDAG

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