Formative Assessment Practical Set-Up
Formative Assessment Practical Set-Up
Navigate the knowledge tree: 🌿 Biology ➡ NCEA Level 2 Biology ➡ 2.1 Investigation ➡ Lesson 6: Formative Assessment Practical Set-Up
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Navigate the knowledge tree: 🌿 Biology ➡ NCEA Level 2 Biology ➡ 2.1 Investigation ➡ Lesson 6: Formative Assessment Practical Set-Up
Learning Intentions
By the end of this topic, you should be able to:Learning Intentions
Determine the aim and write a testable hypothesis for the method provided.
Identify the independent, dependent, and control variables in the method provided.
Follow the method closely to set up the osmosis investigation correctly.
Check my set-up to reduce errors and improve reliability.
Glossary
Key terms and definitions.Glossary
word: Definition
word: Definition
word: Definition
word: Definition
word: Definition
word: Definition
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Method for the Osmosis in KÅ«mara Investigation
Method for the Osmosis in KÅ«mara Investigation
Identify the variables in the method provided
Identify the variables in the method provided
Remember, that the investigation aims to determine the relationship between the independent and dependent variable, but only if the control variables are kept the same.Â
Independent variable
Independent variable
The one thing you change on purpose, and usually appears on the x-axis of a graph.
Dependent variable
Dependent variable
The thing you measure, and usually appears on the y-axis of a graph. It may or may not change because of the independent variable
Control variables
Control variables
Things you keep the same to keep the test fair. It prevents other factors from affecting the results.
Determine the aim and write a testable hypothesis for the method provided
Determine the aim and write a testable hypothesis for the method provided
Remember that there are two types of errors that could weaken the accuracy or reliability of your results. You must identify these and figure out what you will do to minimise the effect of these sources of error.
What's the aim?
What's the aim?
The aim clearly states what the investigation is trying to find out. It must include:
The independent variable (what is changed).
The dependent variable (what is measured).
What's a hypothesis?
What's a hypothesis?
A hypothesis is a testable prediction based on scientific ideas (osmosis). A strong hypothesis:
Links the independent and dependent variables.
Explains why the change is expected (or not).
Identify the possible sources of error in this method provided
Identify the possible sources of error in this method provided
What are the potential sources of systematic errors?
What are the potential sources of systematic errors?
Systematic errors cause results to be consistently too high or too low. They affect accuracy, not reliability.Â
As a result of systematic errors, results may:
Appear consistent, but are in fact not the true value (are wrong).
Create trends that look valid (true) but are inaccurate.
What are the potential sources of random errors?
What are the potential sources of random errors?
Random errors cause results to vary unpredictably between repeats. This lowered precision affects reliability, not accuracy.Â
As a result of systematic errors, results may:
Be scattered with the pattern much harder to see.
Have means that are still accurate, but the data is less reliable.
For the osmosis investigation, these are the specific errors you must consider:
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Glossary
Key terms and definitions.Glossary
aim: A clear statement that explains what the investigation is trying to find out.
control variables: The factors that are kept the same to make sure the test is fair.
dependent variable: The variable that is measured in the investigation.
fair test: An investigation where only one variable is changed and all others are controlled.
hypothesis: A testable prediction that explains what you think will happen and why.
independent variable: The variable that is changed on purpose in an investigation.
method: A step-by-step description of how an investigation is carried out so it can be repeated.
osmosis: Movement of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane.
reliability: How consistent results are when an investigation is repeated.
repeat: Multiple trials of the same condition to improve reliability.
testable: Something that can be measured or observed through an investigation.
validity: How well an investigation tests the hypothesis. Are measurements measuring what they’re supposed to measure? Does the method test what it’s supposed to test?
Practice Tasks for Different Thinking Skills
Practice Tasks for Different Thinking Skills
Need help? Consider getting Private Tutoring or Personalised Feedback for your work from Lemonade-Ed's Mrs. Heald.Â
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