Lengthy Relationship Biology Lab Report Template (Page 2 of 3) in pdf

Part B

1. Measure and mark off a distance of 2,000 cm (20m) (D).

2. Walk the length while counting the number of strides (Nw). Record in Data Table 2.

3. Run the length while counting the number of strides (Nr). Record in Data Table 2.

4. Calculate the stride length (S) by dividing the distance (D) by the number of strides (N)

Walking: Sw = 2,000cm / Nw; Running: Sr = 2,000cm / Nr

5. Measure and record your leg length.

6. Calculate the ratio of your stride length to leg length (S/L). Record in Data Table 2.

7. Graph (draw a graph using the data from as many people as possible, showing the relationship between stride

length and leg length). Make a scatter graph for this, placing stride length on the x axis, and leg length

on the y axis; for each person, place a clear dot where those two measurements meet in the graph; after

data for all people are plotted, notice that there may be a clustered path of dots, suggesting a correlation;

draw a straight line through the middle of that path of dots; use that line to estimate the likely leg length

for a person with a particular stride.

8. Repeat #6 and #7, but comparing stride with height (S/H)

DISCUSSION

1. Do you see a pattern on the graph? Explain.

2. Superimpose all (or several of) the group's graphs and determine if there are any relationships between the

variables.

3. Determine if foot length can be used to predict height. Test you hypothesis by measuring the foot lengths

and corresponding heights of as many people as possible, then plot those points on a scatter graph. Now, take

one foot length measurement and, using your graph, predict the height of that person. Now, measure the height

of that person. How close are you to the actual height? Calculate your percent error (difference between

predicted and actual, divided by the actual, then multiply this by 100). Explain.

4. Pool the class data for the ratio of Foot Length to Leg Length. What is the average F/L ratio for people

based on the class data?

5. Paleontologists use the ratio of stride length divided by leg length (S/L) to tell whether a dinosaur is walking,

trotting, or running. Paleontologists use the following ratios to determine how a dinosaur might have been

moving. If ration is less than 2, it was probably walking; if between 2 and 2.9, it was trotting; if more than 2.9,

it was likely running. <2 = walking; 2 - 2.9 = trotting; >2.9 = running

Examine the class data for the ratios of stride to leg length (Sw/L and Sr/L) to see if the values in the above

chart would also apply to people. If not, what values would change?

ANALYSIS & APPLICATION

1. If a person's footprints were discovered in someone's backyard, what information could be determined about

the person who made the footprints? What information about the person could not be determined from the

footprints?

2. If you had a dinosaur trackway, how could you use the processes we learned in this activity to draw some

conclusions about the dinosaurs that made the tracks?

Lengthy Relationship Biology Lab Report Template Page 2