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

SOLUTION:

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

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