Analyze and Evaluate Data

A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science. The following videos explain the steps of the Scientific Method
1. Asking Scientific Questions
2. Planning and Recording
3. Analyze, Conclude and Evaluate

Drawing Conclusions

1. Analyze the data

• Plot a line graph or chart to help you spot patterns.
• Draw a line of best fit.
• See how the dependent variable is affected by the independent variable
• Use your scientific knowledge to suggest a reason.

2. Writing a conclusion

• State what you have found out.
• Start by saying what the investigation shows.
• Describe any relationship you can see between the two variables.
• Use your graph to support your conclusion.
• Compare your results with your prediction.

Evaluating Data
After collecting data and analyzing it you need to evaluate your data and methods.
Two ways to evaluate your investigation:

• Discuss the quality of the data you have collected.
• Suggest and explain improvements to your method so you can collect data of better quality if you repeat the experiment.

What’s the spread?
The spread of data tells you how precise the data is.
A small spread in the data will give you more confidence in your conclusion.

There are two types of error:

• Random error.
• Systematic error

Range and number of results
Suggest Improvements
• Include bigger range, take more readings<.
• Use different apparatus to give a smaller spread and fewer outliers.

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