Course introduction

5 important questions on Course introduction

In which three ways can you describe the centre of your distribution?

- Mode
- Median
- Mean

When should you use the mode to calculate the centre of your observations?

When you have to deal with categorical values.

How do you calculate the interquartile range?

You divide the distribution into 4 equal quartiles, by finding the median, and then finding the medians of the median. Then you calculate Q3-Q1.
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What does a large variance indicate?

That the values in the distribution are more spread out around the mean.

How are the z-scores ordered in a bell-shaped distribution?

68% of the observations fall between -1 and 1
95% of the observations fall between -2 and 2
99% of the observations fall between -3 and 3

The question on the page originate from the summary of the following study material:

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