Unit 7 Investigating Data Study Guide

Front

What is a positive correlation?

Back

A positive correlation is a relationship between two variables where, as one variable increases, the other variable also increases.

Front

What is a negative correlation?

Back

A negative correlation is a relationship between two variables where, as one variable increases, the other variable decreases.

Front

What does 'no correlation' mean?

Back

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

Front

Define mode in statistics.

Back

The mode is the value that appears most frequently in a data set.

Front

Define median in statistics.

Back

The median is the middle value of a data set when it is ordered from least to greatest.

Front

Define mean in statistics.

Back

The mean is the average of a data set, calculated by adding all values and dividing by the number of values.

Front

What are quartiles?

Back

Quartiles are values that divide a data set into four equal parts, with Q1 being the first quartile, Q2 the median, and Q3 the third quartile.

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is the difference between the third quartile (Q3) and the first quartile (Q1), representing the middle 50% of the data.

Front

What is a box-and-whisker plot?

Back

A box-and-whisker plot is a graphical representation of a data set that shows the minimum, first quartile, median, third quartile, and maximum.

Front

How do you find the mode of a data set?

Back

To find the mode, identify the number that appears most frequently in the data set.