Statistics Review

Front

What percent of data lies within 1 standard deviation from the mean?

Back

68%

Front

What percent of data lies within 2 standard deviations from the mean?

Back

95%

Front

What percent of data lies within 3 standard deviations from the mean?

Back

99.7%

Front

What is the mean in a data set?

Back

The average of all data points.

Front

What is the median in a data set?

Back

The middle value when data points are arranged in order.

Front

What is the mode in a data set?

Back

The value that appears most frequently.

Front

What does it mean if data is skewed right?

Back

There are more lower values and a few high values, causing a tail on the right.

Front

What does it mean if data is skewed left?

Back

There are more higher values and a few low values, causing a tail on the left.

Front

How do you calculate the margin of error?

Back

Margin of Error = Z * (Standard Deviation / √n), where Z is the Z-score.

Front

What is a normal distribution?

Back

A probability distribution that is symmetric about the mean, showing that data near the mean are more frequent.