Standard Deviation

Find the standard deviation of the following numbers:

60, 18, 42, 113, 95, 23

• 32.7

• 35.3

• 33.0

• 34.1

Find the standard deviation of the following numbers:

28, 31, 54, 28, 17, 30

• 11.4

• 10.9

• 12.9

• 11.1

Which distribution has a greater standard deviation?

• A

• B

How does the standard deviation change when 7 is replaced with 12?

• It increases

• It decreases

• It stays the same

• It's divided by 2

Which one of the data sets has a standard deviation of zero

• 2, 3, 4, 3, 2

• 1, 3, 5, 3, 1

• 2, 2, 9, 2, 2

• 2, 2, 2, 2, 2

Standard deviation means...

• how much the data typically deviates from the median

• how much the data typically deviates from the mean

• how much the data typically deviates from the mode

• how much the data typically deviates from the variance

A teacher gives a quiz and the scores are: 6, 7, 8, 9, 10. The teacher decides to add 2 points to each score... the data are now: 8, 9, 10, 11, 12. What was the effect of adding 2 point to each score on the Standard Deviation?

• The Standard Deviation increases by 2

• The Standard Deviation stays the same

• The standard deviation increases by 4

What's the standard deviation of the first 10 natural numbers?

(Use population formula)

• 2.23

• 2.15

• 2.87

• 2.34

You have found the following ages (in years) of 4 zebras. The zebras are randomly selected from the 45 zebras at your local zoo:

7,1,9,14

What are the units of the standard deviation?

• years

Mr. B has an imaginary garden with 5 imaginary lemon trees. The number of imaginary lemons that grew on each imaginary tree are: 12, 14, 5, 13, 11

Find the standard deviation (use a calculator!)

• 2.34

• 5.23

• 10

• 3.16