AP Statistics

Chapter 2 review

“Are you feeling normal today?”

1) The scales of density curves are adjusted so that the total area under

each curve is what?

10.

5

99.7

0%

0% 0%0%0%

1. πr2

2. 1

3. .50

4. 99.7%

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2) What is the relationship between the mean and the median of a symmetric

density curve?

Mea

n >

med

ian

Mea

n =

med

ian

Mea

n <

med

ian

Husb

and a

nd wife

0% 0%0%0%

10

1. Mean > median

2. Mean = median

3. Mean < median

4. Husband and wife

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3) The symbol μ represents what in statistics?

The

populat

ion m

ean.

The

sound

a c

ow po...

The

populat

ion s

tanda.

.

The

populat

ion m

edia

n.

0% 0%0%0%

1. The population mean.

2. The sound a cow population makes.

3. The population standard deviation.

4. The population median.

10

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4) Which of the following does not describe the overall shape of a normal curve?

Sym

met

ric

Sin

gle-p

eake

d

Bel

l-shap

ed

Par

abolic

0% 0%0%0%

1. Symmetric

2. Single-peaked

3. Bell-shaped

4. Parabolic

VOTE

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5) Interpret the notation N(100,15).

Norm

al d

istri

bution w

...

Nic

e di

strib

ution

with..

Norm

al d

istri

bution w

...

Nic

e di

strib

ution

wit...

0% 0%0%0%

1. Normal distribution with 100% of data between standard deviation of 15.

2. Nice distribution with n = 100 and mean = 15.

3. Normal distribution with mean 100 and standard deviation 15.

4. Nice distribution with mean 100 and standard deviation 15.

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A normal distribution of scores has a mean of 92 and standard deviation of

8. If you had a score of 104, what would be the z-score?

.9 1.5 -.75

-1.5

25% 25%25%25%

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10 SecondsRemainin

g

1. 0.9

2. 1.5

3. -0.75

4. -1.5

7) Mr. Hammond missed 12% of the questions on the biology test. This means

that…

His

sco

re is

the

12th

...

His

sco

re is

the

88th

...

His

z-s

core

is 1

2.

None

of the

abo

ve is

...

0% 0%0%0%

1. His score is the 12th percentile.

2. His score is the 88th percentile.

3. His z-score is 12.

4. None of the above is necessarily true.

10

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8) Precalculus test: μ = 60, σ = 12AP Statistics test: μ = 58, σ = 5

Mr. Brownson scored 72 in Precalc and 68 in AP Stats. In which class did he

do better?

Pre

calc

ulus

AP S

tatis

tics

0%0%

1. Precalculus

2. AP Statistics

:10

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9) What does it mean when a z-score is negative?

The

data

is s

kewed

to...

The

med

ian is

sm

alle

r...

The

data

entry

is b

el..

The

data

conta

ins

a lo

...

0% 0%0%0%

1. The data is skewed to the left.

2. The median is smaller than the mean.

3. The data entry is below the mean.

4. The data contains a lot of put-downs.

10

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Participant Scores

900 Participant 8

900 Participant 2

900 Participant 9

900 Participant 17

900 Participant 13

10) What conclusion do you come to if a normal probability plot is linear?

The

data

is n

ormal

ly d

...

The

data

is n

ot norm

a...

The

data

can b

e fit

ted...

0% 0%0%

1. The data is normally distributed.

2. The data is not normally distributed.

3. The data can be fitted with a linear model. 1010

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11) What z-score indicates the 70th percentile?

0.7

0.52 0.

3-0

.52

0% 0%0%0%

1. .70

2. .52

3. .30

4. -.52

10

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12) Which of the following can be used to determine if data is normally distributed?

I. Make a histogramII. Check the 68-95-99.7% rule

III. Make a normal probability plot

I only

II o

nly

III o

nly

I an

d II o

nly

II a

nd II

I only

I an

d III o

nly

I, II

, and II

I

0% 0% 0% 0%0%0%0%

10

1. I only

2. II only

3. III only

4. I and II only

5. II and III only

6. I and III only

7. I, II, and III1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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13) What is the percentage of data that falls within two standard deviations in a

normal distribution?

50%

68%

95%

99.7

0%10

0%

0% 0% 0%0%0%

1. 50%

2. 68%

3. 95%

4. 99.7%

5. 100%

10Seconds

Remaining

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A standard normal table (Tbl A) shows the percentage _?_ the standard score.

33%

33%

33%

Above Below In between

10

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1. Above

2. Below

3. In between

Participant Scores

0 Participant 1

0 Participant 2

0 Participant 3

0 Participant 4

0 Participant 5