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 symmetric, 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. The probability of each outcome is the same.

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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.

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What is no correlation?

Back

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

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How can you identify a skewed distribution in a histogram?

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A skewed distribution in a histogram can be identified by the asymmetry of the bars, where one side has a longer tail than the other.

Front

What is a scatter plot?

Back

A scatter plot is a graphical representation of two variables where each point represents an observation. It helps to visualize the relationship between the variables.

Front

What does it mean if a scatter plot shows a positive correlation?

Back

If a scatter plot shows a positive correlation, it means that as the value of one variable increases, the value of the other variable also tends to increase.

Front

What is the purpose of data analysis in understanding relationships between variables?

Back

The purpose of data analysis is to identify patterns, correlations, and trends in data, which helps in making informed decisions based on the relationships between variables.