Flashcard - ELS Topic 2 (S-ID)

Front

What is a skewed distribution?

Back

A skewed distribution is a probability distribution that is not symmetrical, where one tail is longer or fatter than the other. It can be positively skewed (right tail longer) or negatively skewed (left tail longer).

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What is a normal distribution?

Back

A normal distribution is a symmetrical, bell-shaped distribution where most of the observations cluster around the central peak, and probabilities for values further away from the mean taper off equally in both directions.

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What is a uniform distribution?

Back

A uniform distribution is a type of distribution in which all outcomes are equally likely; every interval of values has the same probability.

Front

What does a scatter plot represent?

Back

A scatter plot is a graphical representation of two variables, showing how much one variable is affected by another. It displays values for typically two variables for a set of data.

Front

What does positive correlation mean?

Back

Positive correlation means that as one variable increases, the other variable also tends to increase. It indicates a direct relationship between the two variables.

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What does negative correlation mean?

Back

Negative correlation means that as one variable increases, the other variable tends to decrease. It indicates an inverse relationship between the two variables.

Front

What is correlation?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or zero (no correlation).

Front

How can you identify a skewed distribution in a histogram?

Back

A skewed distribution in a histogram can be identified by the asymmetry of the bars; if the bars are concentrated on one side with a tail extending to the other side, it indicates skewness.

Front

What is the purpose of a scatter plot?

Back

The purpose of a scatter plot is to visually display the relationship between two quantitative variables, helping to identify patterns, trends, or correlations.

Front

What does it mean if there is no correlation between two variables?

Back

If there is no correlation between two variables, it means that changes in one variable do not predict changes in the other variable; there is no discernible relationship.