Exploring Data Review

Front

What summary statistics should be used to describe skewed data?

Back

The median and IQR (Interquartile Range) are used to describe skewed data because they are not affected by outliers.

Front

What does standard deviation measure in a dataset?

Back

Standard deviation measures the spread or dispersion of a set of values around the mean.

Front

Define a residual in the context of regression analysis.

Back

A residual is the difference between the observed value and the predicted value in a regression model.

Front

What is the midpoint of a dataset called?

Back

The midpoint of a dataset is called the median.

Front

What does the distribution of a variable indicate?

Back

The distribution of a variable indicates what values that variable takes and how often it takes them.

Front

When is the mean a better measure of central tendency than the median?

Back

The mean is a better measure of central tendency when the data is symmetrically distributed without outliers.

Front

What is the purpose of using the IQR in data analysis?

Back

The IQR (Interquartile Range) is used to measure the spread of the middle 50% of the data and is resistant to outliers.

Front

How do you interpret a high standard deviation?

Back

A high standard deviation indicates that the data points are spread out over a wider range of values.

Front

What is the relationship between the mean and median in a skewed distribution?

Back

In a skewed distribution, the mean is pulled in the direction of the skew, making it different from the median.

Front

What does a box plot visually represent?

Back

A box plot visually represents the distribution of a dataset, showing the median, quartiles, and potential outliers.