International A Level Biology / Ecology

Student's t-test revision notes

Edexcel International A Level Biology (YBI11), chapter 15: Ecology, specification point A.1.9, A.1.10. Part of the full course.

Watch the video lesson · International A Level Biology past papers

Student’s t-test compares the means of two groups to decide whether their difference is likely to be real or due to chance. You calculate t, compare it with a critical value, then explain the result in the context of the data.

More lessons in Ecology

• Population, community, habitat and ecosystem
• Succession: from colonisation to climax
• Abiotic factors and population size
• Biotic factors: predation, competition and disease
• How the niche explains distribution and abundance
• Core practical 11: random sampling with quadrats
• Core practical 11: transects and abiotic measurements
• Null hypotheses and choosing a statistical test
• Spearman's rank correlation coefficient
• The chi-squared test