AP Statistics Unit 1 Review

Front

What is relative frequency?

Back

Relative frequency is the ratio of the number of times an event occurs to the total number of trials or observations. It is often expressed as a percentage.

Front

How do you calculate percentile rank?

Back

Percentile rank is calculated by determining the percentage of scores in a distribution that are equal to or below a particular score. The formula is: (Number of values below the score + 0.5 * Number of values equal to the score) / Total number of values * 100.

Front

What does it mean if the mean is greater than the median in a distribution?

Back

If the mean is greater than the median, the distribution is typically right-skewed, meaning there are a few high values that pull the mean up.

Front

What is a stemplot?

Back

A stemplot (or stem-and-leaf plot) is a method of displaying quantitative data in a graphical format, similar to a histogram, to retain the original data values while showing their distribution.

Front

What is the relationship between mean and median in a symmetrical distribution?

Back

In a symmetrical distribution, the mean and median are equal.

Front

What is the purpose of using percentiles in statistics?

Back

Percentiles are used to understand the relative standing of a value within a data set, indicating how a particular score compares to the rest of the data.

Front

What does it mean for a distribution to be skewed?

Back

A skewed distribution is one where the data points are not symmetrically distributed around the mean, leading to a longer tail on one side.

Front

How do you interpret a 75th percentile?

Back

A 75th percentile means that 75% of the data points fall below this value, indicating it is higher than the majority of the data.

Front

What is the significance of the interquartile range (IQR)?

Back

The interquartile range (IQR) measures the spread of the middle 50% of a data set and is calculated as the difference between the 75th percentile (Q3) and the 25th percentile (Q1).

Front

What is the difference between a population and a sample?

Back

A population includes all members of a specified group, while a sample is a subset of the population used to represent the group.