Stats Lesson 2.2 - GOOD

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 first quartile (Q1)?

Back

The first quartile is the value that separates the lowest 25% of the data from the rest.

Front

What is the median in a data set?

Back

The median is the middle value when the data is ordered from least to greatest.

Front

What is the third quartile (Q3)?

Back

The third quartile is the value that separates the highest 25% of the data from the rest.

Front

In a normal distribution, what percentage of data falls within one standard deviation of the mean?

Back

Approximately 68% of the data falls within one standard deviation of the mean.

Front

What percentage of data falls within two standard deviations of the mean in a normal distribution?

Back

Approximately 95% of the data falls within two standard deviations of the mean.

Front

What is the empirical rule in statistics?

Back

The empirical rule states that for a normal distribution, about 68% of data falls within one standard deviation, 95% within two, and 99.7% within three standard deviations.

Front

What does a density curve represent?

Back

A density curve represents the distribution of a continuous random variable, showing the probability of different outcomes.

Front

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

Back

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

Front

What is the area under a density curve?

Back

The area under a density curve represents the total probability, which is always equal to 1.