HSW

Question 1

Valid conclusions (4)

Answer 1

• Large sample size SO representative
• Long study SO can allow…. / see effect of X
• Control used SO comparison can be made.
• Mean & SD SO significant differences can be determined.

Question 2

Limitations:

You can only use the information provided (6)

Answer 2

• Small sample size, not representative;
• Only sampled males, females may respond differently to treatment;
• Only tested on …….. in a lab, in the wild, may obtain different pattern in data;
• Only tested on …….. species, might not be true for all species;
• No STATS test so differences could be due to chance;
• Data is SUBJECTIVE, some people may have lied.

Question 3

Null hypothesis (4)

Answer 3

• [x] will have no effect on [y]
• E.g. Temperature will have no effect on rate of reaction
• There will be no correlation between age and weight
• There will be no difference between the observed and expected ratio of 3:1 brown eyes to blue eyes