1 Flashcards
What is variability?
Differences… how things differ. There is variability everywhere… We all look different, have different preferences.. Etc.
What is Statistics(textbook)
The science of collecting, organizing, summarizing, analyzing, and making inferences from data.
What are the two major branches of statistics we will study this year?
Inferential and Descriptive
What are Descriptive Stats?
Numbers and pictures that describe nature of a data set, provide info about data that is present.
What are Inferential Stats?
Making inferences…saying what is actually going on in the population, making predictions, using statistics to estimate parameters.
Compare descriptive to inferential?
Descriptive seeks to tell you about what is in the data at hand, inferential reaches out to the world at large.
What is data?
Any collected information. Generally each little measurement…
What is a population?
The group you’re interested in. Sometimes it’s big, like “all teenagers in the US” other times it is small like”Mr. Nystrom’s fifth period class.” You calculate parameters from populations.
Compare population to sample
Population are generally large, and samples are small subsets of these population. We talk samples to make an inference about what we think is true on the population. We use statistics to estimate parameters.
What is a parameter?
A numerical summary of a population. Like a mean,median, range… of a population
What is a statistic?
A numerical summary of a sample. Like a mean, median, range … of a sample.
What is a sample?
A subset of a population, often taken to make inferences about the population.
What is statistics(Nystrom’s def)?
The study of variability.
