## 4.11 **Drills**: computational exercises

*(Answers are available in Sect. A.4)*

These **Drill** exercises (repeated practice) give you practice at getting computations correct,
and using your calculator.
These drill questions are more about practising the underlying *mathematics* rather than the *statistics*.

**ask**.

- The data in Table 4.3 give the heights of female tennis players at the Australian Institute of Sport (AIS) in metres (Telford and Cunningham 1991).
- Using your calculator's
*Statistics Mode*, find the**mean**and**standard deviation**of these numbers. - Without using a calculator, find the
**median**of these numbers.

- Using your calculator's

167.9 | 177.5 | 162.5 | 172.5 | 166.7 | 175 | 157.9 |

- The data in Table 4.4 give the usage, in tonnes, of polythene by 8 UK cosmetic companies (Gilchrist 2000).
- Using your calculator's
*Statistics Mode*, find the**mean**and**standard deviation**of these numbers. - Without using a calculator, find the
**median**of these numbers.

- Using your calculator's

8.001 | 29.4 | 266.532 | 4298.7 | 94.5 | 2547.3 | 676.2 | 0 |

- The data in Table 4.3 give the percentage body fat of females swimmers at the Australian Institute of Sport (AIS) (Telford and Cunningham 1991).
- Using your calculator's
*Statistics Mode*, find the**mean**and**standard deviation**of these numbers. - Without using a calculator, find the
**median**of these numbers.

- Using your calculator's

14.52 | 11.47 | 17.71 | 18.48 | 11.22 | 13.61 | 12.78 | 11.85 | 13.35 |

### References

Gilchrist R. Regression models for data with a non-zero probability of a zero response. Communications in Statistics-Theory and Methods. Taylor & Francis; 2000;29(9-10):1987–2003.

Telford RD, Cunningham RB. Sex, sport, and body-size dependency of hematology in highly trained athletes. Medicine and Science in Sports and Exercise. 1991;23(7):788–94.