Descriptive Statistics Review

Which curve has the smallest mean?

• A

• B

• C

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

What is the z-value at the mean?

• 0

• 0.5

• 1

• 2

Tags

CCSS.HSS.ID.A.4

What is the probability to the left of the mean in a normal distribution?

• 100%

• 68%

• 50%

• 99.7%

Tags

CCSS.HSS.ID.A.4

Which curve has the smallest standard deviation?

• A

• B

• C

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

When the z-value is negative, the probability is _____

• negative

• positive

• 0

• 50% - probability

Tags

CCSS.HSS.ID.A.4

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

• 1

• 2

• 3

• 4

Tags

CCSS.HSS.ID.A.4

The probability of randomly choosing an item greater than z = 0.61 from a normal probability distribution is...

• less than 50%

• greater than 50%

• almost 0

• almost 100%

Tags

CCSS.HSS.ID.A.4

CCSS.HSS.MD.A.3

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

• Mean

• Median

• Mode

Tags

CCSS.HSS.ID.A.1

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

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

Tags

CCSS.HSS.ID.A.4

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

• TRUE

• FALSE

Tags

CCSS.HSS.ID.A.4