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VIP Practice Exercise: Normal Distribution

Practice Exercise: Normal Distribution

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Question 1 of 9

Which of the following is true about the normal distribution?

A

the mean, median, and mode are roughly equal

B

there are an equal number of values on both sides of the mean (symmetrical)

C

it is often referred to as a "bell curve."

D

All of the above

Question 2 of 9

What percent of the values of a distribution are between 1 standard deviation below the mean and 1 standard deviation above the mean?

A

34%

B

47.5%

C

68%

D

95%

E

99%

Question 3 of 9

What percent of the values of a distribution are between 3 standard deviation below the mean and 3 standard deviation above the mean?

A

34%

B

47.5%

C

68%

D

95%

E

99%

Question 4 of 9

What percent of the values of a distribution are between 2 standard deviation below the mean and 2 standard deviation above the mean?  

A

34%

B

47.5%

C

68%

D

95%

E

99%

Question 5 of 9

Which of the following characteristics of the normal distribution allows us calculate the percent of values that are between standard deviation values?

A

the normal distribution is symmetrical about the mean

B

the normal distribution is unimodal

C

the mean, model, and median are equal

D

all of the above

Question 6 of 9

To determine the value for 1 standard deviation above the mean, we...

A

add the standard deviation to the mean

B

subtract the standard deviation from the mean

C

add the standard deviation to the mean twice

D

subtract the standard deviation to the mean twice

Question 7 of 9

To determine the value for 1 standard deviation below the mean, we...

A

add the standard deviation to the mean

B

subtract the standard deviation from the mean

C

add the standard deviation to the mean twice

D

subtract the standard deviation to the mean twice

Question 8 of 9

To determine the value for 2 standard deviations above the mean, we...

A

add the standard deviation to the mean

B

subtract the standard deviation from the mean

C

add the standard deviation to the mean twice

D

subtract the standard deviation to the mean twice

Question 9 of 9

To determine the value for 2 standard deviations below the mean, we...

A

add the standard deviation to the mean

B

subtract the standard deviation from the mean

C

add the standard deviation to the mean twice

D

subtract the standard deviation to the mean twice

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