Exam 18: Descriptive Statistics

To calculate a variance, you take the square root of the standard deviation.

Compare and contrast descriptive and inferential statistics.

If the owner of Microsoft moved into your neighborhood, which of the following statistical indexes for the income in your neighborhood would become radically larger?

The mean is:

The mean is the square root of the mode.

A contingency table is a matrix based on two or more categorical variables used in a research study.

Joe wants to make assumptions about characteristics of a population based upon his sample. In order to do this he must use:

Read and interpret bar graphs, line graphs, and scatter plots.

Harold needs to calculate a median. The scores he has are: 10, 1, 9, 3, 4, 8, 6, 5, 2, and 7. The median is:

Approximately what percentage of scores falls within one standard deviation of the mean in a normal distribution?

What kind of skew is there in the below distribution?

If the mean is greater than the median, the data are probably skewed to the left.

The variance is the average distance of the scores from the mean, in squared units.

In graphing the relationship between two variables in a scatter plot, which axes contain the independent and dependent variable?

A grouped frequency distribution contains each unique data value in the rows of the table.

On his statistics test, Tom has to calculate a mean on the following scores: 5, 5, 10, 15, and 15. What answer should he come up with?

Claudia calculated the standard deviation for her data. The value she came up with was 9. What is the variance for her data?

In a regression equation, the Y-intercept defines:

List the strengths and weaknesses of the mode, median, and mean.

Measures of central tendency provide a: