Home of real teaching & learning
- Full support for teachers
- Focus on critical thinking
- Engaging classroom activities
- Integrated student eBook
- Assessed tasks / qBank
- Practice exam questions
The InThinking Guarantee: Our sites are written by expert practitioners and not by AI
See our AI policyDisclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.
Don't miss out, find out!
- Free trials Take out a one month free trial today!
- Newsletters Subscribe to our FREE subject site newsletters.
Recommendations
Read what users are saying about the site.Video overview
Site authors
IB Approved Workshops
Environmental systems and societies (New Syllabus)
IB DP Category 1
Berlin, Germany, 30 October - 1 November 2026
Find out more
Environmental systems and societies: A focus on internal assessment
IB DP Category 3
Paris, France, 13 - 15 November 2026
Find out more
Environmental systems and societies (New Syllabus)
IB DP Category 2
Paris, France, 19 - 21 February 2027
Find out moreVirtual Think-Ins
Keys to Success: Teaching Statistics & Data Skills in DP Biology & ESS
3 November 2026
Find out more
Focus On: IB Teaching – A Practical Guide for Teachers new to the IB
20 November 2026
Find out more
Keys to Success: The IA in DP ESS: Initiating & managing
23 November 2026
Find out moreInThinking Shorts
Getting the most out of InThinking Subject Sites
12 October 2026
Find out more
Getting the most out of InThinking Subject Sites
15 October 2026
Find out more
Find all InThinking events at
inthinking.net
Quote of the day
I am here to say, our house is on fire. [...] I want you to act as you would in a crisis. I want you to act as if our house is on fire.
InThinking
Supporting international schools with high quality PD & interactive online resources
Creative
Personal
Selected student pages
See allMost popular
See allRecommendations
See all"Very comprehensive overview of the course. As an experienced ESS Teacher, it was still useful to see new/additional resources and to have everything in a resource. I have used InThinking for IB DP Chemistry before and do use it regularly as a teacher...."
Sarah Urquhart
Yokohama International School
"Zoe and Laura from InThinking are amazing! I was thrown into teaching ESS very last minute and under tragic circumstances. Without their beautifully thought out and expertly crafted resources, I would have been lost. Their relevant and wide ranging case..."
Naomi Vincent
American International School of Kingston
Subscriber comments
-
Hi Zoe, Do you have some model answers for this activity? Thank you!
4.4 Management of Eutrophication -
Many thanks for pointing this out. I've updated the page with Lisa's help behind the scenes. You were, of course, correct.
X-Y Scatter Graphs -
With the trials being = 5 is it not too small a sample to calculate the standard error? From your "Measures of Variability" it says that SE needs minimum 30 samples. I would guess that very few IA's have that amount of data (but I could be wrong)....
X-Y Scatter Graphs
Laura
Site authorHi Julia, I've updated the page with a link to the answers. You can choose to let students have access to this whenever you want
4.4 Management of Eutrophication