_______ is the evidence of gathering, describing, and analyzing data
statistics
________ are the actual numerical descriptions of sample data.
statistics
What are the three subsets of the target population?
sampled population
sample frame
sample
A _____ is a study in which data are obtained from every member of the population
census
A ________ is a group from which the sample is taken
sampled population
A ___________ is a physical list of all members of the sampled population.
sampling frame
A ________ is a subset of the population from which data are collected. Must encompass the makeup of the target population.
sample
Q: What is the difference between a population and a sample?
The population would represent the target population and the sample should be a representative subset of that population.
What is a variable?
a value or characteristic that changes among members of the population.
ie 4, or blue
Describe data?
are the counts, measurements, of observations, gathered about a specific variable in a population in order to study it.
Describe a parameter?
is a numerical description of a population characteristic
What is a sample statistic?
a numerical description of sample characteristics
Q: What is the difference between a parameter and a statistic?
?
Population vs Sample
Which is this?
Whole group
Group we want to know about
Characteristics are called parameters
Parameters are generally unknown
Parameters are fixed
This describes the population
Population vs Sample
Which is this?
Part of the group
Group we do know about
Characteristics are called statistics
Statistics are always known
Statistics change with sample
This describes a sample
Identify the population and the sample.
a. In a survey, 359 college students at the University of Jackson were asked if they had tried the October flavor of the month at the campus coffee shop. Eighty-three of the students surveyed answered yes.
The population is the University of Jackson students.
The sample that was surveyed = 359 students
Identify the population and the sample.
b. A survey of 1125 households in the U.S. found that 24% subscribe to satellite radio.
The population is all of the American households
And the sample = 1125 which represents those that were contacted.
Identify Population, Sample, Parameters, and Statistics
I. After an airplane security scare on Xmas day, 2009, the Gallup organization interviewed 542 American air travelers about increased security measures at airports. The report stated that 78% of American air travelers are in favor of U.S. airports using full-body imaging on airline passengers.
The population is all Americans
542 are the sample
78% is the Statistic measured off of the 542 Sample
Identify Population, Sample, Parameters, and Statistics
Rasmussen Reports also conducted a survey in response to the airport security scare on Xmas, 2009. The national telephone survey of 1000 adult Americans found that 59% of Americans surveyed favor racial profiling as a means of determining which passengers to search at airport security checkpoints.
All Americans are the (target) population
a Sample of 1000 that were contacted
and a sample Statistic of 59%
What are the two branches of Statistics?
descriptive
inferential
What is meant by descriptive statistics?
as a science, gathers, sorts, summarizes and displays the data
What is inferential statistics?
as a science, involves using descriptive statistics to estimate population parameters.
List the two types of analysis?
exploratory
confirmatory
