AP Statistics Unit 1 Review

Front

What are the stems used in a stemplot for the ages: 3, 10, 42, 25, 5, 8, 6, 12, 15, 4, 3, 21?

Back

0, 1, 2, 3, and 4

Front

Which statement is NOT justified by the back-to-back stem-and-leaf plot of drop-out rates?

Back

The drop-out rate decreased in each of the 49 schools between the 1989-90 and 1992-1993 school years.

Front

How do you compare scores from two different subjects with normal distributions?

Back

Use z-scores to standardize the scores for comparison.

Front

What is the relative frequency of students ages 14-17 who skip breakfast if it is about 27%?

Back

About 27% of students ages 14-17 skip breakfast.

Front

What does a standardized score (z-score) of -1.2 indicate about a student's performance?

Back

The student scored below the mean, specifically 1.2 standard deviations below the mean.

Front

What is a stemplot and how is it used in statistics?

Back

A stemplot is a graphical representation of quantitative data that displays the distribution of data points.

Front

What is the mean in a normal distribution?

Back

The mean is the average of all data points and is the center of the normal distribution.

Front

What does standard deviation measure in a data set?

Back

Standard deviation measures the amount of variation or dispersion of a set of values.

Front

How do you calculate a z-score?

Back

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

Front

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

Back

The median is the middle value that separates the higher half from the lower half of the data set.