Statistics and Probability 11

What are the two major areas in statistics

• descriptive and inferential

• description and inferential

• description and inference

• quantitative and qualitative

It consists of the totality of the observations

• Sample

• Parameter

• Population

• Variable

Has no numerical value

• Qualitative

• Quantitative

• Qualytative

• Quantytative

A subset of population

• parameter

• variable

• mean

• sample

the two types of variables are:

• quantity and quality

• quantitative and qualititative

• nominal and ratio

• ratio and proportion

Data with only one variable

• Variable

• X/Y

• Univariable

• Constant

Police reports show that the crime rates in an area were reduced by 50% over the past five months

• Descriptive

• Inferential

The median of 1,2,3,4,5,6,7 is 4

• Descriptive

• Inferential

Order matters, but the differences do not

• Nominal Scale

• Order Scale

• Ordinal Scale

• Interval Scale

What deals with non-numeric or numbers that have no value?

• Nominal Scale

• Interval Scale

• Ratio Scale

• Order Scale