AP Statistics Unit 2 Review (2020 - 2021)

Front

What does it mean if a score is at the 64th percentile?

Back

It means that the score is higher than 64% of the scores in the distribution.

Front

What is the formula for calculating a standardized score (z-score)?

Back

z = (X - μ) / σ, where X is the score, μ is the mean, and σ is the standard deviation.

Front

What is the significance of the mean in a data set?

Back

The mean is the average of all data points and represents the central tendency of the data.

Front

What does a negative z-score indicate?

Back

A negative z-score indicates that the score is below the mean of the distribution.

Front

How do you interpret a z-score of 0.27?

Back

A z-score of 0.27 indicates that the score is 0.27 standard deviations above the mean.

Front

What is the relationship between percentiles and quartiles?

Back

Percentiles divide the data into 100 equal parts, while quartiles divide the data into 4 equal parts.

Front

What is the standard deviation and why is it important?

Back

Standard deviation measures the dispersion of data points from the mean; it indicates how spread out the values are.

Front

If a score is at the 25th percentile, what does that imply?

Back

It implies that 25% of the scores fall below that score.

Front

How do you calculate the actual score from a z-score?

Back

Actual score = μ + (z * σ), where μ is the mean and σ is the standard deviation.

Front

What does it mean for a distribution to be bell-shaped?

Back

A bell-shaped distribution, or normal distribution, has a symmetric shape with most data points clustering around the mean.