Exam 18: Descriptive Statistics

The denominator (bottom) of the z score formula is:

An IQ score of 100 is equivalent to a z score of ____.

The median is:

Explain percentile ranks and z scores.

For the following set of scores: 100, 150, 200, 250, 275, 300, 500. What is the median?

In a simple regression, the regression coefficient tells you:

Distinguish between inferential and descriptive statistics.

If the mean is less than the median, the data are probably skewed to the right.

Explain the impact of skewness on the measures of central tendency.

Which of the following distributions is negatively skewed?

Explain the difference between simple and multiple regression.

In regression, the slope of the regression line is indicated by the:

Approximately what percentage of scores falls within two standard deviations of the mean in a normal distribution?

In a normal distribution, 95% of the scores fall between z scores of:

The standard deviation is:

Explain what we mean by positive and negative skew.

The two subfields in estimation are point and interval estimation.

What is the variance?

Percentile ranks and z scores describe where a score falls in relation to other scores in the distribution of data.

Explain how to construct and interpret a contingency table.