Statistics quiz

More questions about Statistics

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   What term means the entire group being studied?

   Answer: Population

   Why: Measuring an entire population is called a census rather than a sample survey.

2. 2 Medium

   Which theorem explains why natural measurements follow bell curves?

   Answer: Central Limit Theorem

   Why: Abraham de Moivre proved a first case for coin tosses in 1733, and George Polya gave the theorem its name in 1920.

3. 3 Hard

   What term describes the number of independent values in a calculation?

   Answer: Degrees of freedom

   Why: Ronald Fisher popularised the term in 1922 while showing that Karl Pearson had counted the degrees of freedom of his chi-squared test wrongly.

4. 4 Easy

   What inactive treatment is given to a clinical trial control?

   Answer: Placebo

   Why: In double-blind studies, neither participants nor researchers know who gets the placebo.

5. 5 Medium

   Why is a Type I error commonly called a false alarm?

   Answer: Rejected true null

   Why: Jerzy Neyman and Egon Pearson named this mistake in a 1933 paper, and the false alarm rate a study accepts is alpha, by convention 5 percent.

6. 6 Hard

   What statistical term describes the 'peakedness' of a data distribution?

   Answer: kurtosis

   Why: Karl Pearson coined the term in 1905 from the Greek kyrtos, meaning curved; statisticians now say it tracks heavy tails more than the peak.