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Review 10/22

Total questions: 31

Worksheet time: 8hrs 45mins

Name
Class
Date
1.

What does this symbol represent?

a)

Standard Deviation

b)

Variance

c)

Mean Absolute Deviation

d)

Sigma

2.
Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Roger's scores?
a)
193
b)
127
c)
60
d)
66
3.
Find the mean of these numbers:
5,11,2,12,4,2
a)
4.1
b)
6
c)
4.5
d)
4
4.
What is the mean?
a)
# happening the most
b)
the number in the middle
c)
biggest-smallest
d)
the average
5.
Which of the following is a measure of variability?
a)
mean
b)
median
c)
mode
d)
standard deviation
6.
At Donald's Donuts the number of donut holes in a bag can vary. Help Donald find the mode.
12, 10, 10, 10, 13, 12, 11, 13, 10
a)
13
b)
12
c)
11
d)
10
7.
This data is normally distributed.  What percent of the data is in the shaded region?
a)
68%
b)
95%
c)
99.7%
d)
50%
8.
a)
Skewed Left
b)
Skewed Right
c)
Uniform
d)
Symmetric
9.
a)
Skewed Right
b)
Skewed Left
c)
Uniform
d)
Symmetric
10.
a)
Skewed Right
b)
Skewed Left
c)
Uniform
d)
Symmetric
11.
a)
Skewed Right
b)
Skewed Left
c)
Uniform
d)
Symmetric
12.

What is the standard deviation for the data given:

{12, 13, 29, 18, 61, 35, 21}

a)

293.67

b)

15.87

c)

17.14

d)

41.98

13.
According to the empirical rule, what percentage of data falls within 1 standard deviation? 
a)
25%
b)
68%
c)
95%
d)
99.7%
14.
According to the empirical rule, how much of the data falls within 3 standard deviations? 
a)
25%
b)
68%
c)
95%
d)
99.7%
15.
What is the Normal Range (68%) of the annual precipitation for Phoenix, if the average is 29 with a standard deviation of 3?
a)
26-32
b)
3-29
c)
26-29
d)
39-32
16.
The z-score represents.....
a)
the amount of standard deviations a data value is above or below the mean.
b)
the percentile the data value is above or below the mean.
c)
the amount of standard deviations a data value is above or below the median.
d)
the percent the data value is above or below the mean.
17.

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

a)

2.26

b)

16.45

c)

-2.26

d)

1.26

18.

Find the Z-score.

Mean = 21

Standard Deviation: 1.3

x = 22

a)

0.77

b)

5.33

c)

1.07

d)

1.26

19.

Find the mean.

Z-score = -1.4

Standard Deviation: 7

x = 20

a)

29.8

b)

10.2

c)

-21

d)

35

20.
If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? 
a)
-5
b)
-2
c)
2
d)
5
21.
The normal curve is symmetrical about the mean.
a)
True
b)
False
22.

Find the z-score value corresponding if the location is below the mean by 2 standard deviations

a)

+2.00

b)

-2.00

c)

+1.25

d)

-1.00

23.

Find the z-scores value corresponding if the location is above the mean by 1/2 standard deviations

a)

-0.50

b)

+1.00

c)

+0.50

d)

-1.00

24.

What is always the z-score for the mean?

a)

-1

b)

+1

c)

0

d)

It doesn't have one!

25.

If I have a positive z-score, am I ABOVE or BELOW the mean?

a)

ABOVE

b)

BELOW

26.

Use the image of the normal graph provided. What is the value of the mean?

a)

6

b)

34

c)

52

d)

70

27.

Use the image of the normal graph provided. What is the value of the standard deviation?

a)

6

b)

12

c)

36

d)

18

28.

Use the image of the normal graph provided. What percent of values are less than 46?

a)

16%

b)

84%

c)

46%

d)

12.5%

29.
Adam's Z-score on a test is +2.5.  What does this mean?
a)
He'd better start studying.
b)
He did better than EVERYONE.
c)
He scored 2.5 standard deviations above the average.
d)
He did terrible.
30.
Joanne's Z-score is -1.5.  What does this mean?
a)
She didn't take the test yet.
b)
She scored 1.5 standard deviations below the average.
c)
She did better than most people.
d)
No clue
31.
Let's go back to the ACT vs. the SAT.
How can we tell who "did better" between someone who got a 31 on the ACT and someone who got 1400 on the SAT?
a)
Random guess?
b)
1400 is higher so it's better
c)
Find the Z-scores!
d)
Flip a coin?

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