AP Statistics - Unit 1

Front

What is the 1.5 × IQR rule for identifying outliers?

Back

An outlier is a data point that is more than 1.5 times the interquartile range (IQR) above the third quartile or below the first quartile.

Front

How do you calculate the interquartile range (IQR)?

Back

IQR = Q3 - Q1, where Q3 is the third quartile and Q1 is the first quartile.

Front

What does a right-skewed distribution indicate about the data?

Back

A right-skewed distribution indicates that the majority of the data points are concentrated on the left side, with a long tail extending to the right.

Front

What information does a boxplot provide?

Back

A boxplot summarizes the distribution of a dataset by displaying its median, quartiles, and potential outliers.

Front

What does σ represent in statistics?

Back

σ represents the population standard deviation, which measures the dispersion of a set of values in a population.

Front

How do you find the mean of two groups with different sizes?

Back

Overall mean = (Mean1 * n1 + Mean2 * n2) / (n1 + n2), where n1 and n2 are the sizes of the two groups.

Front

What is the difference between population and sample standard deviation?

Back

Population standard deviation (σ) is used for entire populations, while sample standard deviation (s) is used for samples drawn from a population.

Front

What does it mean if a dataset is bimodal?

Back

A bimodal dataset has two different modes, or values that appear most frequently.

Front

What is the significance of the median in a dataset?

Back

The median is the middle value that separates the higher half from the lower half of the dataset, providing a measure of central tendency.

Front

How can you identify the mode of a dataset?

Back

The mode is the value that appears most frequently in the dataset.