Comparative Stem and Leaf Diagram of Error Lines
Key: 0 4=0.4 cm
Year 7: 0.4, 0.4, 0.6, 0.6, 0.6, 0.6, 0.9, 1.4
Year 11: 0.4, 0.6, 0.6, 0.6, 0.6, 0.9, 0.9, 1.6
Year7
Mode: 0.6 cm
Median: 0.6 cm
Lower quartile: 0.5 cm
Upper quartile: 0.75 cm
Interquartile range: 0.75-0.5=0.25 cm
Semi-interquartile range: 0.25÷2=0.125 cm
Year 11
Mode: 0.6 cm
Median: 0.6 cm
Lower quartile: 0.6 cm
Upper quartile: 0.9 cm
Interquartile range: 0.9-0.6=0.3 cm
Semi-interquartile range: 0.3÷2=0.15 cm
Aware to on track with my second hypothesis and to avoid endless
diagrams, I’ve only chosen year 7(youngest) and 11(oldest) for this
interpretation.
Year 7 had smaller values than the year 11. There was 25% of year 7
who were 0.4 cm away from the actual line whilst 12.5% of year 11 was
at this category.
The two year groups both had 50% of people who were 0.6 cm away from
the actual line. However, 25% of year 11 were 0.9 cm within whilst
12.5% of year 7 were at the same category. 12.5% of year 11 were 1.6
cm within whilst 12.5% of year 7 were 1.4 cm within. This all sums up
that year 7 are better at estimating since there were more of them
closer to the actual measurement. This is evidence against my
hypothesis.
Comparative stem and leaf diagram of error angles
Key: 0 2=02°
Year 7: 02, 03, 03, 07, 08, 08, 08, 08
Year 11: 02, 07, 08, 08, 08, 08, 08, 08
Year 7
Mode: 8