Week 16_Mon Z scores

What is the z-score for a data value that is below the mean by 2 standard deviations?

• +2.00

• -2.00

• +1.25

• -1.00

What is the z-score for a data value that is above the mean by 1/2 a standard deviation?

• -0.50

• +1.00

• +0.50

• -1.00

z-scores are the standardized scores for any data that is Normal.

• True

• Sometimes true, sometimes false

• False

Tags

CCSS.HSS.ID.A.4

Use the formula to find the Z-score.

Mean = 50

Standard Deviation: 10

x = 54

• 0.4

• -0.4

• 49

• 0

If a z-score is positive, that means the value is ABOVE the mean.

• True

• Sometimes true, sometimes false

• False

If a z-score is negative, that means the data value falls BELOW the mean.

• True

• Sometimes true, sometimes false

• False

Use the formula to find the Z-score.

Mean = 27

Standard Deviation = 1.4

x = 11

• -11.43

• 7.85

• -2.33

• 4.16

What is the purpose of z-scores?

• to describe the exact location of a score within a distribution

• to find the mean of the distribution

• to describe the shape of the distribution

• to find the standard deviation of the distribution

What is the formula to find the z-score for population?

• z=X-M

• z=σ-M/μ

• ^z/M=μ

• z=X-μ/σ

Tags

CCSS.HSS.ID.A.4

The sign of the z-score indicates whether the location is above(positive) or below(negative) the mean.

• True

• False