The document summarizes a measurement investigation that aimed to compare head circumference and arm length in Grade 4 students. It was hypothesized that the students' arm lengths would be greater than their head circumferences. Fifteen students were measured and the results showed their head circumferences were generally greater than their arm lengths, contradicting the initial hypothesis. The conclusion notes more data is needed to make the results more reliable.

1. Measurement Investigation
Aim: To investigate the relationship between head circumference and arm
length.
Hypothesis: I predict that the Grade 4 students’ arm length will be greater than
their head circumference.
Materials:
1 measuring tape
1 pencil
1 sheet of paper
1 clipboard
15 grade 4 students
Method:
1. Collect your materials.
2. Draw a table with 3 columns (name, head, arm, difference).
3. Ask someone if you can measure his or her head.
4. Put the 0cm tape on their head and put it on their forehead and
roll the measure tape around their head.
5. Record the number of the centimeters shown on the measure
tape. This is the person’s head circumference.
7. Put the 0cm of the measuring tape at the end of the arm.
8. Pull the measuring tape to the shoulder.
9. Record the number of centimeters shown on the measuring
tape. This is the person’s arm length.
10. Repeat the measurements for 14 other students.
Result:
Name Head Arm Difference
(cm) (cm) (cm)
Sajid 54cm 44cm +10cm
Geon Woo 54cm 39cm +15cm
Diana 54cm 33cm +16cm
Annie 53cm 44cm +9 cm

2. Hanson 53cm 42cm +5cm
Sarthak 51cm 42cm +9cm
Hyun Seo 56cm 37cm +18cm
Kota 53cm 41cm +12cm
Kazuki 56cm 48cm +6 cm
Jermaine 54 cm 54 cm +4 cm
Jack 56 cm 50 cm +6 cm
Kaopoon 51 cm 42 cm +9 cm
Benedict 55 cm 45 cm +10 cm
Na Youn 49 cm 37 cm +12 cm
Jashua 54 cm 35 cm +19 cm
Conclusion:
Our hypothesis was incorrect because our head was greater span
then our arm span.
Discussion:
Our sample was only fifteen 9-10 years old. We need to measure
more people to make our data more reliable.