Flex Quiz

Standard deviation tells us how spread out a symmetric distribution is. 
Since a Z-score tells us how many standard deviations away from average something is, what does a high Z-score mean?

• It's way higher than average
• tl:dr
• you're in trouble?
• you need a doctor

Tags

CCSS.HSS.ID.A.4

Adam's Z-score on a test is +2.5.  What does this mean?

• He'd better start studying.
• He did better than EVERYONE.
• He scored 2.5 standard deviations above the average.
• He did terrible.

Tags

CCSS.HSS.ID.A.4

Joanne's Z-score is -1.5.  What does this mean?

• She didn't take the test yet.
• She scored 1.5 standard deviations below the average.
• She did better than most people.
• No clue

Tags

CCSS.HSS.ID.A.4

If Gonzalo's score is 87, the class average is 82, and the SD is 4, what is Gonzalo's Z-score?

• -1.25
• +1.25
• +1.20
• +1.02

Tags

CCSS.HSS.ID.A.4

Jill's Z-score on the same test was a +3.0.  (average was 82 and SD was 4).  
What was her actual score?

• 85 %
• 79 %
• 94 %
• 40 %

Tags

CCSS.HSS.ID.A.4

What is the Z-score for Tina if she got a 31 on the ACT, the mean was 23 and the SD was 4?

• +0.2
• +2.0
• -2.0
• -0.2

Tags

CCSS.HSS.ID.A.4

What is the Z-score for Paula if she got 1400 on the SAT, the mean was 1100 and the SD was 275?

• -1.90
• -1.09
• +1.09
• +1.90

Tags

CCSS.HSS.ID.A.4

So if Tina's Z-score is +2.0 and Paula's Z-score is +1.09, who performed better?

• Tina's performance is farther away from the mean so she did better.
• Paula's score is closer to the mean so she did better.
• They both did the same.
• Can I take a nap now?

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5

Your latest test score had an average of 80 with a SD of 8 points.  
If you got a 96, what is your Z-score?

• -2.0
• 16%
• +2.0
• pi

On the same test, your best friend got a 76. (Mean = 80, SD = 8)
What's her Z-score?

• 0.5
• -0.5