Normal Distribution Vocabulary Review

What shape does a normal distribution have?

• symmetrical

• skewed

• uniform

• any shape

What is a standard deviation?

• average distance from the mean

• middle 50%

• number of deviations from the mean

• raw data

What is a z-score?

• average distance from the mean

• middle 50%

• number of standard deviations above/below the mean

• raw data

If the z-score is positive, what does that tell us about the data value?

• it's above the mean

• it's below the mean

• it's the same as the mean

• it's a good z-score

If the z-score is negative, what does that tell us about the data value?

• it's above the mean

• it's below the mean

• it's the same as the mean

• it's a good z-score

If the z-score is 0, what does that tell us about the data value?

• it's above the mean

• it's below the mean

• it's the same as the mean

• it's a good z-score

What percent of the data values fall within 1 standard deviation of the mean?

• 34%

• 68%

• 95%

• 99.7%

Tags

CCSS.HSS.ID.A.4

What percent of the data values fall within 2 standard deviations of the mean?

• 34%

• 68%

• 95%

• 99.7%

Tags

CCSS.HSS.ID.A.4

What percent of the data values fall within 3 standard deviations of the mean?

• 34%

• 68%

• 95%

• 99.7%

Tags

CCSS.HSS.ID.A.4

Which description is true about any data values with a z-score above 3 or below -3?

• unusual/outliers

• normal

• important

• eccentric