Statistics 304, CH 1

Quantitative variable has two types

Discrete, Continuous

Ordinal level

Ranking can be made against a tag. Involves data arranged in some orders, the differences between the data values cannot be determined

Statistics

the science of collecting, organizing, analyzing, and interpreting data in order to make effective decisions

Population

A collection of all individuals, objects, measurements

Types of variables

1. Qualitative/attributive, 2. quantitative

Inferial statistics

A decision, estimate, prediction about a population based on a sample

Interval level

Applies to data that can be arranged in order. In addition, differences between data values are meaningful.

Quantitative

Information is reported numerically

Nominal Level

Naming, labelling, identification

Qualitative

The characteristics being studied is non numerical

Ratio Level

a level of measurement that has all the properties of an interval level scale and also has a true zero point

Sample

a portion, or part, of the population of interest

continous

can assume any value within a specified range FRACTIONAL

Types of stats

descriptive and inferential

Discrete

it can only assume certain values and there are usually gaps between values WHOLE NUMBER number of students (example)

Four level of measurements

nominal, ordinal, interval, ratio

descriptive statistics

numerical data used to measure and describe characteristics of groups. Methods of organizing, interpreting, summerizing, presenting data in an informative way