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Assessing Normality. When is the data Normal enough?. Use the 68-95-99.7 Rule. Plot the data and check for the shape to be……. Determine if ____ % of the data is within 1 standard deviation Determine if 95% of the data is within ___ standard deviations

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Assessing normality

Assessing Normality

When is the data Normal enough?


Use the 68 95 99 7 rule
Use the 68-95-99.7 Rule

  • Plot the data and check for the shape to be…….

  • Determine if ____ % of the data is within 1 standard deviation

  • Determine if 95% of the data is within ___ standard deviations

  • Determine if ____ % of the data is within ____ standard deviations


Normal probability plot
Normal Probability Plot

  • X-axis is the data scale

  • Y-axis is the z-score scale

  • All data is converted to its z-score and plotted as (data, z-score)

  • Data should appear linear if it is Normal


Shape from normal probability plot
Shape from Normal Probability Plot

  • Symmetric = Linear

  • Skewed Right = few large values, so large x-values will fall to the right of the line

  • Skewed left = few small values, so small values will fall to the left of the line


Refrigerator space

ENTER IN YOUR CALC IN L1

Refrigerator Space

The following is a sample of 36 side-by-side refrigerators and their capacity (in cubic feet). Are the data close to Normal?


My calculator example
My Calculator Example

On the Emulator


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