Statistics Final Exam

An internet media and market research firm measured the amount of time an individual spends viewing a specific Webpage. The data in the accompanying table represent the amount of time, in seconds, a random sample of 40 surfers spent viewing a Webpage tell the pop, sample, and individuals

pop: all surfers that viewed the webpage Sample: randomly selected 40 people out of the population that viewed the page individual: one person that viewed the page

The entire group of individuals to be studied is called the

population

Nominal level of measurement

variables whose values have no mathematical interpretation; they vary in kind or quality but not in amount

The process of statistics

(1) Identify the research objective (2) Collect the data needed to answer the question(s) posed (3) Describe the data (4) Perform inference

discrete variable

is a quantitative variable that has either a finite number of possible values or a countable number of possible values.

Statistics...

is is the science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions. In addition, statistics is about providing a measure of confidence in any conclusions.

A statistic

a numerical measurement describing some characteristic of a sample

Continuous variable

a quantitative variable that has an infinite number of possible values that are not countable

is a subset of the population that is being studied is called

a sample

a person or object that is a member of the population being studied is called

an individual

Quanitative variable

Numerical variables. Represents a measurable quantity Two types: Discrete or continuous

An internet media and market research firm measured the amount of time an individual spends viewing a specific Webpage. The data in the accompanying table represent the amount of time, in seconds, a random sample of 40 surfers spent viewing a Webpage describe the data set

Qualitative, Continuous, Ratio

inferential statistics

numerical methods used to determine whether research data support a hypothesis or whether results were due to chance

A parameter is a

numerical summary of a population