AP Stats: Chapter 2 Multiple Choice Practice Test

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 interquartile range (IQR)?

Back

The IQR is the difference between the third quartile (Q3) and the first quartile (Q1) in a data set, representing the middle 50% of the data.

Front

What is a standard Normal distribution?

Back

A standard Normal distribution is a Normal distribution with a mean of 0 and a standard deviation of 1.

Front

How do you find the actual score from a standardized score (z-score)?

Back

Use the formula: Actual Score = Mean + (z-score * Standard Deviation).

Front

What does a z-score represent?

Back

A z-score indicates how many standard deviations an element is from the mean.

Front

What is the significance of the mean in a Normal distribution?

Back

The mean is the central point of the distribution, where the highest frequency of scores occurs.

Front

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

Back

It means that the data follows a bell-shaped curve, where most values cluster around the mean.

Front

What is the cumulative relative frequency graph used for?

Back

It shows the proportion of data points that fall below a certain value in a dataset.

Front

What is the relationship between percentiles and quartiles?

Back

Quartiles divide the data into four equal parts, while percentiles divide it into 100 equal parts.

Front

What does it mean if 14% of cockroaches weigh more than 55 grams?

Back

It indicates that 55 grams is at the 86th percentile of the weight distribution.