AP Stats Semester 1 Review Warm Up #2

Front

What is a histogram?

Back

A histogram is a graphical representation of the distribution of numerical data, where the data is divided into bins or intervals, and the frequency of data points in each bin is represented by the height of the bars.

Front

What does the median represent in a data set?

Back

The median is the middle value of a data set when it is ordered from least to greatest. It divides the data into two equal halves.

Front

What is a z-score?

Back

A z-score is a statistical measurement that describes a value's relationship to the mean of a group of values, expressed in terms of standard deviations from the mean.

Front

What does it mean if a score is above the mean?

Back

If a score is above the mean, it indicates that the score is higher than the average score of the data set.

Front

What is a simple random sample?

Back

A simple random sample is a subset of individuals chosen from a larger set, where each individual has an equal chance of being selected.

Front

What is the purpose of using random numbers in sampling?

Back

Using random numbers in sampling ensures that every member of the population has an equal chance of being selected, reducing bias in the sample.

Front

What is the standard deviation?

Back

The standard deviation is a measure of the amount of variation or dispersion in a set of values. A low standard deviation indicates that the values tend to be close to the mean, while a high standard deviation indicates that the values are spread out over a wider range.

Front

How do you interpret a z-score of 1.75?

Back

A z-score of 1.75 means that the value is 1.75 standard deviations above the mean of the data set.

Front

What is the lower quartile in a data set?

Back

The lower quartile (Q1) is the median of the lower half of a data set, representing the 25th percentile.

Front

What does it mean if a distribution is approximately normally distributed?

Back

If a distribution is approximately normally distributed, it means that the data follows a bell-shaped curve, where most of the data points cluster around the mean and the probabilities for values further away from the mean taper off symmetrically.