- At intervals of 0.5m or 0.2 m we randomly grabbed five stones
- we measured the longest side in mm using a ruler
- judged roundness by comparing them to diagrams ranging from 'very rounded' to 'very angular' another member of our group tallied these results into a table
Strengths and Weaknesses:
- one day to visit all the sites so 5 was the most accurate way for us to record the results
- By comparing them to diagrams our results would be comparable to people who used the same diagram
- Could have improved investigation by using the same person at everysite to determine the roundness as perceptions can differ
- Unlikely that people would pick up the larger rocks so our results were biased towards smaller rocks
- By measuring the longest side of each rock you get a reliable comparison
Method of Data presentation:
BOX PLOT
s used to display information about the range, the median and the quartiles. It is usually drawn alongside a number line,
We plotted the results of site 2 as this is where our anomoly of 912mm occured
Biggest and smallest size// upper and lower quartile// median
Because our measurements were tallied in a box of ranges e.g. from 0.-5mm the upper quartile and the median were the same. It was also difficult because 4 of our range measurements actually applied to this site and we would need five to complete the graph correctly.
Our biggest sediment size was an anomaloy from the rest of the group
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