## 4.2 Using the calculator statistics mode

Bamboo is a fast-growing, strong grass useful for green building practices. A small research study explored the properties of bamboo when used as flooring material, including the bending strength (the Modulus of Rupture, or MOR, in MPa).

Five different bamboo floorboards were provided by Bamboo Flooring Australia Pty Ltd and assessed by the Queensland Department of Primary Industries (Gerber 2004).

The five MOR test results (in MPa) are:

`99.2 111.2 97.6 101.1 104.0`

- Identify the type of RQ being answered: descriptive, relational, or interventional. Justify your answer.
- Use your calculator’s statistics mode to compute the mean and the standard deviation.

If you are using your calculator correctly, you should get \(\bar{x}=102.62\) and \(s=5.356\).
If you get \(s=4.790157\) for the

*standard deviation*, you are using your calculator incorrectly, so please**ask for help**.- Compute the median MOR of the flooring. (Most calculators cannot compute the median; you will need to do this by hand.)
- Compute the range of the MOR values.
- What specifications would you report about the MOR of bamboo flooring based on these data?
- What would be the implication if all five values were from the
*same*floorboard?

### References

Gerber, Stefan. 2004. “Material Properties of Bamboo Flooring.” Compliance Report 2-04. Indooroopilly, Queensland: Queensland Department of Primary Industries, for Bamboo Flooring Pty Ltd.