Dec 6 B2 BW Standard deviation and z-scores

Front

What is the formula for finding z-scores?

Back

Front

What does a z-score represent?

Back

A z-score represents the number of standard deviations a data point is from the mean of a data set.

Front

How do you calculate the z-score for a given value?

Back

Front

What is the mean in a normal distribution?

Back

The mean is the average of all data points in a normal distribution and is the center of the distribution.

Front

What is the standard deviation in a normal distribution?

Back

The standard deviation measures the dispersion or spread of data points around the mean in a normal distribution.

Front

If a student scores 31 on the ACT with a mean of 21 and a standard deviation of 5, what is the z-score?

Back

Front

If a data value is equal to the mean, what is its z-score?

Back

If a data value is equal to the mean, its z-score is 0.

Front

What is the z-score for a data value of 60, when the mean is 50 and the standard deviation is 4?

Back

Front

What is the symbol for z-score?

Back

The symbol for z-score is Z.

Front

What does a positive z-score indicate?

Back

A positive z-score indicates that the data point is above the mean.