Finding z-scores & using z-tables

What percent of scores are below a z-score of  $z=-3.26$ ?  (You can use the z-tables from last class's work too!)

• .0006%

• 0.06%

• 6%

• 0.6%

A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for 265.

• $z=250.5$

• $z=1.25$

• $z=-1.02$

• $z=-1.25$

What is the standard deviation on this Normal Curve?

• 6

• 12

• 34

• 18

What is the value of the mean on this Normal Curve?

• 6

• 34

• 52

• 70

What percent of scores are below a z-score of  $z=2.34$ ?  (You can also use the z-table from last class's work.)

• 99.04%

• 0.96%

• 98.93%

• 97.68%

The median is in the center of a Normal Curve.

• True

• Sometimes true, sometimes false

• False

What percent of values are less than 46?

• 16%

• 84%

• 46%

• 12.5%

What does it mean to have a z-score of  $z=0$  on a quiz?

• It means you did better than zero people.

• It means you scored the same grade as the average grade.

• It means you earned a zero on the quiz.

• It means the average score was a zero.

What percent of scores are at or below a z-score of  $z=1.42$ ? (You can use the z-table from last class's work!)

• 92.22%

• .9222%

• 92.07%

• .9207%

What percent of scores are below a z-score of  $z=-1.02$ ?  (You can also use the z-table from last class's work!)

• 15.87%

• 15.39%

• 9.68%

• 84.61%