27. Quiz: Notation for the Mean

Notation for Quizzes

For the below quiz, let the following letters denote the corresponding notation:

A.   \bold{X}                   

B.   \bold{Y}                   

C.   \bold{x_1}                  

D.   \bold{n}                    

E.   \bold{\sum\limits_{i=1}^nx_i}

QUIZ QUESTION::

Use the letter next to the notation above to match the notation to the description of what the notation represents.

ANSWER CHOICES:

A

B

C

D

E

Notation Letter	Description
The notation for a random variable.
The notation for the first observed value of a random variable.
The notation for a random variable.
The notation for the number of rows in our dataset.
The notation for all of the values in our dataset.
The notation for the number of columns in our dataset.
The notation for all of the values in our dataset.
The notation for the sum of all the values in our dataset.

SOLUTION:

Notation Letter	Description
The notation for a random variable.	A
The notation for a random variable.	B
The notation for the first observed value of a random variable.	C
The notation for a random variable.	A
The notation for a random variable.	B
The notation for the number of rows in our dataset.	D
The notation for the sum of all the values in our dataset.	E

Notation for Quizzes

For the below quiz, let the following letters denote the corresponding notation:

A.   \bold{\sum\limits_{i=1}^nx_i}

B.   \bold{\frac{\sum\limits_{i=1}^nx_i}{n}}

C.   \bold{\bar{x}}

D.   \bold{\bar{y}}

E.   \bold{\frac{\sum\limits_{j=1}^ny_j}{n}}

If we wanted to provide notation for the mean of a particular dataset, which of the following letters would correspond to the notation attached to calculating the mean? (Mark all that apply.)

A

B

C

D

E

SOLUTION:

• B
• C
• D
• E