- The people who measured the stack of books in the last section were given some scientific training on how to measure
accurately.
- They practiced reading the scale on the ruler to the nearest millimeter. They placed stack of books on a sturdy table and put a heavy weight on it to make sure that
excess space between and within books was eliminated. They made sure that the stack of books was straight and that the ruler was held snugly against the books, and so on
- Their measurements were as follows:
- Notice how this set of data compares with the previous set:
| |
First
set |
Second
set |
| Median |
23.8 |
23.9 |
| Mean |
23.7 |
23.9 |
| Range |
2.4 |
0.8 |
| Mean
Deviation |
0.41 |
0.21 |
| Interquartile
range |
0.5 |
0.4 |
| Variance |
0.35 |
0.06 |
| Standard
Deviation |
0.59 |
0.24 |
- The extra scientific care taken in measuring is reflected in the smaller standard deviation for the second set of data.
|