# MTH265 - Chapter 1 & 2

## 31 terms

### Population

The collection of all outcomes, responses, measurements, or counts that are of interest

### Sample

A subset, or part, of a population

### Parameter

A numerical description of a population characteristic

### Statistic

A numerical description of a sample characteristic

### Descriptive Statistics

The branch of statistics that involves the organization, summarization, and display of data

### Inferential Statistics

The branch of statistics that involves using a sample to draw conclusions about a population

### Qualitative Data

Data that consists of attributes, labels, or nonnumerical entries

### Quantitative Data

Data that consists of numerical measurements or counts

### Nominal

Level of measurement that includes qualitative data only; Data is categorized using names, labels, or qualities; No mathematical computations can be made at this level

### Ordinal

Level of measurement that includes qualitative or quantitative data; Data can be arranged in order, or ranked, but differences between data entries are not meaningful

### Interval

Level of measurement in which data can be ordered, and meaningful differences between data entries can be calculated; Zero entry simply represents a position on a scale, not an inherent zero

### Ratio

Level of measurement in which data can be ordered, and meaningful differences between data entries can be calculated; A zero entry represents an inherent zero

### Midpoint

The sum of the lower and upper limits of a class divided by two

### Frequency Histogram

A bar graph that represents the frequency distribution of a data set

### Ogive

A line graph that displays the cumulative frequency of each class at its upper class boundary

### Class Boundaries

The numbers the separate classes without forming gaps between them

### Class Width

The distance between lower (or upper) limits of consecutive classes.

### Dot Plot

Plot in which each data entry is plotted, using a point, above a horizontal axis

### Pie Chart

A circle that is divided into sectors that represent categories

### Pareto Chart

A vertical bar graph in which the height of each bar represents frequency or relative frequency

### Mean

The sum of the data entries divided by the number of entries

### Median

The value that lies in the middle of the data when the data is ordered

### Mode

The data entry that occurs with the greatest frequency in a data set

### Outlier

A data entry that is far removed from the other entries in the data set

### Deviation

The difference between the entry and the mean of the data set

### Chebychev's Theorem

The theorem that applies to all curves and calculates the percentage of data lying within a certain amount of deviations from the mean

### Quartiles

Approximately divide an ordered data set into four equal parts

### Deciles

Approximately divide an ordered data set into ten equal parts

### Percentiles

Approximately divide an ordered data set into one hundred equal parts

### Z-Score

Represents the number of standard deviations a given value falls from the mean - (value-mean)/standard deviation

### Interquartile Range (Midquartile)

A measure of variation that gives the range of the middle 50% of the data