Unit 4 Quiz

Income in a large population is usually normally distributed.

False

The appropriate measure of central tendency to use with nominal data is which of the following?

Mode

What does the symbol M represent?

the mean

The mean should always be the measure of central tendency used because it is always the most accurate.

False

In a normal curve, where is the highest point of the curve?

In the middle

When a distribution is skewed, what is the best measure of central tendency?

Median

In a perfectly symmetrical distribution, the mean, median, and mode all have the same value.

True

The mean is appropriate to describe a distribution only if it is normally distributed.

True

A positively skewed distribution looks like which of the following?

Peak to the left, tail to the right

What is the best description of a distribution that has 3 peaks?

Trimodal