Stats quiz 1
what is a parameter?
a numerical summary of the population
what is a statistic?
a numerical summary of the sample data
what is a sample?
a part of the population
define qualitative variables
classification of individuals based on some attribute or characteristic
what is the process of statistics?
collect, analyze, summarize, interpret, draw conclusions
what is Data
collections of observations
length of time to take a test
continuous
define discrete variable
countable number, 0,1,2,3
what are the two branches of statistics
descriptive and inferential
number of people waiting in line
discrete
what are the two types of quantitative variables
discrete and continuous
consist of organizing and summarizing data describes data through numerical summaries, tables and graphs like averages
Descriptive statistics
Population or sample? 1.Among the senators in Congress, 54% are Republicans 2. In a large sample, the median annual income per high school graduate is $30,000. 3. A study of all 2233 passengers aboard the Titanic found that 706 survived when it sank.
population statistic population
define quanitative variables
provide numerical measures of individuals, can be added or subtracted to provide meaningful results
what is population?
the entire group of individuals on which we desire information
provides predictions about the population based on the data we collected from the sample includes the level of confidence in the results
Inferential statistic
fill in the blank "the average weight of 20 year old males in the United States will be the _______________. The average weight of 20 year old males at Mercer University will be the ________________.
Parameter, Sample
define continuous variable
infinite number of possible values