Summer Vocab Flashcards
definition of statistics
science of collecting, organizing, summarizing, analyzing and making inferences from data
what is variability?
how things differ, it’s everywhere
2 major brances?
inferential and descriptive
descriptive stats
numbers and pictures describing a data set
inferential stats
inferences, judging the whole population off info from a sample
descriptive vs. inferential
descriptive tells data at hand, inferential tells the world at large
what is data?
collected information and measurements
what is a population?
group you are interested in, big or small, you can calculate parameters from populations
population vs sample
pops are a whole group while samples are just a subset of the pop
we take samples to make inferences about a population
statistics estimate parameters
what is a parameter?
numerical summary of a population, like a mean, median or mode
what is a sample?
subset of a population taken to make inferences, we calculate stats from samples
compare data-stats-parameters using quantitative data
data are individual measures, stats and parameters are summaries, stats are from samples, parameters are from whole population
compare data-stats-parameters using categorical data
same as quantitative only with words and groups (ex. tacos and pizza) instead of numbers
what is a statistic?
numerical summary of data
what is census?
like a sample of an entire population, get info from every member
does a census make sense?
only in small groups
difference between a parameter and a stat?
parameters come from populations
stats come from samples
difference between a census and a sample?
sample is a small subset while a census gets everyone
difference between quantitative and categorical data?
quantitative data are numerical measurements but categorical is qualitative, data is quantitative if you can find the mean and it makes sense, data is categorical if you cant. so basically quantitative is numbers and quantitative are words
difference between a population mean and a sample mean?
population is the mean of its population and its parameter, sample mean is the mean of a sample used for a stat
symbols for a pop mean and sample mean?
pop - a box
sample - x with a line over it
when do we often use mode?
categorical data
how are mean, median, and mode positioned in a skewed left distribution?
mean, median, mode
how are mean median and mode positioned in a skewed right distribution?
mode, median, mean
who chases the tail?
mean and outliers
what hat is joe wearing?
boston red sox
