Descriptive stats

With a bell-shaped or normal distribution, most of the scores are located at the two extreme ends of the distribution.

• True

• False

If a continuous distribution is highly skewed, the median might be the appropriate measure of central tendency.

• True

• False

With data that is normally distributed, the three measures of central tendency tend to differ.

• True

• False

When a distribution consists of very different scores, the standard deviation will be relatively large.

• True

• False

The median is less affected than the mean by extreme scores at one end of a distribution.

• True

• False

z-scores express how many standard deviations a particular score is from the mean.

• True

• False

Negative z scores are further from the mean than positive z scores.

• True

• False

The percentile rank of z = 0 is always 50.

• True

• False

The association between two continuous variables can be plotted on a scattergram.

• True

• False

Even a high correlation is not necessarily indicative of a causal relationship between two variables.

• True

• False