QU1 mod 1 Flashcards
Why do we care about statistics
statistics is a way to get information from data
data not information
what is data
data is a set of numbers that represents some type of metric or measurement
what is information
is what the data means
What is a population
set of all values under consideration (large number, used for stats canada every 5 years?)
- more time, more money to conduct
better quality of information
What is a sample
a sample is a smaller number being considered than a population
- less time and money to conduct
- less quality of information
- used more often
What is descriptive statistics
how data is organized, described an presented:
- mean(average), variance, range etc
- organized and presented using charts
What is inferential statistics
drawing conclusions about the population based on the sample’s data
What is confidence level
confidence level = percentage of times we expect the conclusion drawn from the sample to be right as compared to the population
What is significance level
significance level = percentage of times we expect the conclusion drawn from the sample to be wrong as compared to the population
what are the factors that would affect the confidence/ significance level?
- size of sample
- representation
better samples = more confidence
What is important to know for populations vs samples
whether the data is full population or sample data
- different methods are used on samples than populations
What population calculations called
parameters
what are sample calculations called
statistics
What is a variable
a characteristic of a population or sample that is of interest
What is data
set of observed values for a variable
