STATS Module 1 Part II.

The z-score

• indicates the number of standard deviations a given value is above or below the mean.

• a statistical measurement used to validate a hypothesis against observed data.

• a measure of how dispersed the data is in relation to the mean.

• refers to either of two closely related concepts: the codomain of the function, or the image of the function.

What is a percentile?

• A percentile is a measure indicating the value below which a given percentage of observations in a group of observations fall.

• A percentile is a measure of dispersion in a dataset.
• A percentile is a measure of central tendency in a dataset.
• A percentile is a measure of correlation between two variables.

What is a quartile?

• A quartile is a type of unit of measurement used in cooking recipes.
• A quartile is a type of musical instrument.
• A quartile is a type of geometric shape.
• A quartile divides a data set into four equal parts, each representing 25% of the data.

Define interquartile range.

• The interquartile range is the sum of all quartiles in a dataset.
• The interquartile range is the difference between the third quartile (Q3) and the first quartile (Q1) of a dataset.
• The interquartile range is the difference between the maximum and minimum values in a dataset.
• The interquartile range is the average of the first and third quartiles in a dataset.

To find our outliers we have to determine our

• data visualization
• outlier detection
• data cleaning
• fences

What graph is shown here?

• histogram

• boxplot

• bar graph

• line plot

This graph's distribution is

• symmetrical

• right-skewed

• left-skewed

• outliered

This graph's distribution is

• symmetrical

• right-skewed

• left-skewed

• outliered

This graph's distribution is

• symmetrical

• right-skewed

• left-skewed

• outliered

A scatterplot is

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