Mathematics
Grade 12
45 min
Experiment design
Tutorial Preview
1
A scientist records the songs of different birds at a feeder. Is this an experiment or an observational study?
2
A study shows ice cream sales and crime rates are correlated. Does ice cream cause crime? What is a likely confounding variable?
3
In a drug trial, patients don't know if they get the drug or a placebo. The doctors also don't know. What is this called?
Sample Practice Questions
Easy
A school assigns a new teaching method to one class and compares its scores to another class. What is this?
0.Experiment
1.Survey
2.Obs. Study
3.Case Study
Easy
A study finds more firefighters at a fire is linked to more damage. What is a likely confounding variable?
0.Time of day
1.Size of fire
2.Water type
3.Wind speed
Easy
In a soda taste test, the tasters do not know which brand they are drinking. This is an example of:
0.Blinding
1.Randomness
2.Replication
3.Blocking
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