Scientist 3: John Snow (continued…) L.O: to analyse John Snows work to distinguish between a causal relationship and a correlation Starter: Complete the worksheet on shampoo research to recall knowledge on HSW!

Starter Answers: 1 a) Factor = type of shampoo Outcome = percentage of breakage 1 b) increase the number of hair samples tested / test each sample more than 3 times and calculate an average 1 c i) Person hair is from / length of hair 1 c ii) To ensure the test is VALID, so you can clearly see that only one variable is having an effect.

Correlation and Cause

Activity 1 Solve the anagrams about cause vs. correlation first in the right hand column THEN match it up to the correct paragraph on the right. (e.g. paragraph A does NOT match with anagram 1! Be careful!)

Activity 1 Answers: Paragraph A matches with anagram 8 – larger Paragraph B matches with anagram 3-correlation Paragraph C matches with anagram 6 - chance Paragraph D matches with anagram 4 – control Paragraph E matched with anagram 9 –mechanism Paragraph F matched with anagram 10 – random and anagram 7 - matched Paragraph G matched with anagram 2 – outcome Paragraph H matched with anagram 1 – factors Paragraph I matched with anagram 5 - causes

Activity 2 Complete worksheet on John Snow, to analyse his work on cholera.