Quiz about Ch2 Normal Distributions old

Question 1

Which is the formula for standardized values given in your text?

Accepted Answer

Answer

$$d=\sqrt[]{\left(y_2-y_1\right)^2+\left(x_2-x_1\right)^2}$$

Answer

$$x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}$$

Answer

$$a^2+b^2=c^2$$

Question 2

What is a z-score?

Accepted Answer

number of standard deviations

Answer

relative size of mean

Answer

percent under a density curve

Answer

area of a density curve

Question 3

On one test, your class achieved an average grade of 80 with a standard deviation of 8 points. If you got a 96, what's your z-score?

Accepted Answer

2

Answer

16

Answer

-2

Answer

20

Question 4

What is the z-score of the mean of a distribution?

Accepted Answer

0

Answer

1

Answer

there is not enough information

Answer

I'm really not sure

Question 5

What is the value of a z-score if it is 2 standard deviations above the mean?

Accepted Answer

2

Answer

1

Answer

there is not enough information

Answer

I'm really not sure

Question 6

What value of z-score represents something that is unusual?

Accepted Answer

>3

Answer

>0.3

Answer

>0.03

Answer

>1

Answer

I'm really not sure

Question 7

$$In\ N\left(51,\ 37\ \right)\ what\ is\ 51?$$

Accepted Answer

mean

Answer

z-score

Answer

standard deviation

Answer

median

Answer

I'm really not sure

Question 8

A standard Normal model can be described with:

Accepted Answer

N(0,1)

Answer

N(120,30)

Answer

N(1,0)

Answer

there is no standard Normal

Answer

I'm really not sure

Question 9

How can you check the Nearly Normal Condition mentioned in the book?

Accepted Answer

make a histogram

Answer

calculate the mean

Answer

make a scatter plot

Answer

all data is Normal

Answer

I'm really not sure

Question 10

Normal models are appropriate for what kind of distributions?

Accepted Answer

Unimodal and roughly symmetric

Answer

Skewed with outliers

Answer

Uniform

Answer

Multimodal

Question 11

What kind of letters do we use for parameters?

Accepted Answer

Greek

Answer

Latin

Answer

Roman

Answer

Arabic

Question 12

What is one of the three rules for working with Normal models?

Accepted Answer

Make a picture.

Answer

You must use a pencil.

Answer

Keep your hands and feet to yourself.

Answer

Never divide by zero.

Answer

Just say no.

Question 13

The Normal curve is shaped like a...

Accepted Answer

bell

Answer

potato

Answer

donut

Answer

frog

Question 14

To draw a Normal curve, you must draw the 1 standard deviation line at the ___ on the curve.

Accepted Answer

inflection point

Answer

peak

Answer

center

Answer

baseline

Answer

I'm not really sure

Question 15

The 68-95-99.7 rule says that in a Normal distribution, about 95% of all the data falls within ___ standard deviations from the mean.

Accepted Answer

2

Answer

0

Answer

1

Answer

3

Answer

I'm not really sure

Question 16

In order to use Normal calculations, you must have a data set that meets the Nearly Normal Condition. What is the Nearly Normal Condition?

Accepted Answer

The data is approximately symmetric and unimodal

Answer

The data is skewed with outliers

Answer

The data is uniformly distributed

Answer

The mean is one standard deviation from the median

Question 17

In a Normal model, about ____ of the values fall within 1 standard deviation of the mean.

Accepted Answer

68%

Answer

6%

Answer

100%

Answer

0%

Question 18

In the 68-95-99.7 rule, 95% of data in a Normal model is how many standard deviations from the mean?

Accepted Answer

2

Answer

0

Answer

1

Answer

3

Question 19

A percentile is the percent of data that is ____ a certain value. (You can google the definition)

Accepted Answer

below

Answer

above

Answer

near

Answer

far from

Answer

I'm really not sure

Question 20

What are two good ways to find Normal percentiles? (Select two answers)

Accepted Answer

z table

Accepted Answer

technology such as Stapplet

Answer

calculate using the formula

Question 21

The numbers in the margin of a z table are...

Accepted Answer

z-scores

Answer

Percentiles

Question 22

The 4 digit numbers on the interior of the z table are...

Accepted Answer

percentiles

Answer

z-scores

Question 23

When looking at a Normal curve, the shaded area under the curve represents...

Accepted Answer

percent of data

Answer

the z-scores

Answer

the x values

Answer

amount of shade

Question 24

When looking at a Normal curve, the cut points or cut lines represent...

Accepted Answer

the z-scores or x values

Answer

percent of data

Question 25

The shaded area under the Normal curve between two cut points is called by several names including all but...

Accepted Answer

the in between

Answer

proportion

Answer

fraction

Answer

percent

Question 26

In the picture, the line at 1.2 is known as a ____.

Accepted Answer

cut point

Answer

percentile

Answer

percent

Answer

mean

Question 27

In the picture, the area between the two cut points is know as all of these except...

Accepted Answer

the blood zone

Answer

percent of the curve

Answer

proportion of the curve

Answer

area under the curve

Answer

percent of the curve

Question 28

This is the formula for calculating a z-score.

Accepted Answer

True

Answer

False

Question 29

x values represent the value that we are interested in

Accepted Answer

True

Answer

False

Ch2 Normal Distributions old

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