Descriptive Statistics Review

The line at 11 represents _____

• The mean

• The median

• The mode

• An outlier

What is the z-value at the mean?

• 0

• 0.5

• 1

• 2

Which curve has the smallest standard deviation?

• A

• B

• C

About 95% of observations are within _____ standard deviation(s) from the mean.

• 1

• 2

• 3

• 4

Which of these measures would be the largest for this histogram?

• Mean

• Median

• Mode

If the mean is 20 and the standard deviation is 10, what is the z-value at 30?

• -1.00

• 0.00

• 1.00

• 20.00

True or False: The z-value measures the distance from the mean in standard deviations.

• TRUE

• FALSE

What % of observations are typically within 1 standard deviation of the mean?

• 0

• 50%

• 68%

• 95%

The third quartile is at _____

• 6

• 10

• 11

• 13

What is the probability of randomly choosing an item greater than this z-value?

• 50% + probability

• (big probability) - (little probability)

• (big probability) + (little probability)

• 50% - probability