Dec 3 B1 Stats Ch 2.4 Measures of Variation

Front

What is the formula for calculating standard deviation?

Back

Standard deviation is calculated as the square root of the variance.

Front

What does it mean if a histogram is skewed left?

Back

A left-skewed histogram indicates that the majority of the data points are concentrated on the right side, with a tail extending to the left.

Front

In a normal distribution, what percentage of data falls within two standard deviations of the mean?

Back

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

Front

How do you find the mean of a set of numbers?

Back

Add all the numbers together and divide by the total count of numbers.

Front

What is variance in statistics?

Back

Variance measures how far a set of numbers is spread out from their average value.

Front

If the mean height of a class is 165 cm, what does this indicate?

Back

It indicates that the average height of all students in the class is 165 cm.

Front

What is the relationship between variance and standard deviation?

Back

Standard deviation is the square root of variance.

Front

What does a higher standard deviation indicate about a data set?

Back

A higher standard deviation indicates that the data points are more spread out from the mean.

Front

What is a normal distribution?

Back

A normal distribution is a bell-shaped distribution where most of the data points cluster around the mean.

Front

How do you interpret a standard deviation of 0?

Back

A standard deviation of 0 indicates that all data points are identical and equal to the mean.