Lesson 1-1 Inferential and Descriptive Statistics

Lesson 1-1 Inferential and Descriptive Statistics

Chapter 1-1

Statistics Overview

Variables

• a characteristic or attribute that can assume different values.

• 
  

​Think About It...

If you were going to analyze a data set that yields the equation of a line [(x,y) points] when plotted, don't you agree that the 'y' variable can be many different values? And if the line is a function, the 'x' value will have just as many different values as y, but never less!
What definition of a function is violated if the 'y' has more different values than 'x' ? You will answer this on next slide...

Open Ended

What definition of a function is violated if 'y' has more different values than 'x' ?

Multiple Choice

A variable (or response variable) is

• a characteristic of interest about each individual element of a population or sample

• a characteristic that is irrelevant to the collection of the data

• a characteristic that changes when the data is collected

• a characteristic or trait that will be ignored in a sample population

Descriptive vs Inferential

• Descriptive Statistics are used to summarise the data collected.

• Inferential Statistics are used by the researcher to infer the properties of a population, based on the sample. 

Multiple Choice

These are the two types of statistics:

• Discrete and Continuous

• Population and Sample

• Descriptive and Inferential

• Mean and Standard deviation

Multiple Choice

Tell if the statement if Descriptive or Inferential

From a past study, it was found that 56% of women are the primary investors in their households.

• Inferential

• Descriptive

Multiple Choice

Tell if the statement if Descriptive or Inferential

A recent survey of 2000 adults having an MBA reported that the average salary is more than $65,000 a year.

• Inferential

• Descriptive

Multiple Choice

A prediction has been made that the chance that a person will be robbed in a certain city is 15%.

• Inferential

• Descriptive

Population vs Sample

Multiple Choice

Identify the following data set:

....a manager of a movie theater was asking customers at the concession stand how they would rate the theater’s staff

• Population

• Sample

Multiple Choice

Identify the following data set:

....the rates at which all of the cashiers scan products for a store on a study about the cashiers for the day.

• Population

• Sample

Multiple Choice

Identify the following data set:

....the rates at which all of the cashiers scan products for a store on a study about the cashiers for the day.

• Population

• Sample