Intro Statistics: Concepts & Tests
Curated Statistics deck. Add it to your library and study with spaced repetition.
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What is the mean?
The arithmetic average: sum of values divided by their count.
What is the median?
The middle value when data are ordered.
What is the mode?
The most frequently occurring value in a data set.
What is standard deviation?
A measure of how spread out values are around the mean.
What is the difference between a population and a sample?
A population is the whole group of interest; a sample is a subset drawn from it.
What is a normal distribution?
A symmetric, bell-shaped distribution described by its mean and standard deviation.
What does the empirical (68-95-99.7) rule say?
In a normal distribution, about 68, 95, and 99.7 percent of data fall within one, two, and three standard deviations of the mean.
What is a p-value?
The probability of results at least as extreme as observed, assuming the null hypothesis is true.
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