# (Solved): WPC300 Quiz 3: Descriptive : Scored 10 out of 10...

**WPC300
Quiz 3: Descriptive
Scored 10 out of 10**

**Question 1 1 pts**

The difference between the first and third quartiles is referred to as the ____________.

- midrange
- interquartile range
- variance
- standard deviation

**Question 2 1 pts**

When two variables are highly positively correlated, the correlation coefficient will be _______.

- close to 0
- close to 10
- close to 1
- close to -1

**Question 3 1 pts**

According to statistical notation, what does ∑ stand for?

- to represent sample statistics
- to act as a summation operator
- to represent the number of items in a population
- to represent population measure

**Question 4 1 pts**

What are the three principles of describing data?

- Centrality, dispersion and size
- Dispersion, range and standard deviation
- Mean, median and mode
- Center, spread and shape

**Question 5 1 pts**

For a normal distribution mean is _______ to median.

- greater than
- equal
- less than
- not equal

**Question 6 1 pts**

Which of the following is an example of a sample?

- The population of Canada
- The number of individuals who have a Ford car
- The number of members in the Democratic party
- The number of IT employees out of all employees working in an office of Google

**Question 7 1 pts**

Which of the following describes the standard deviation?

- It is the average of the greatest and least values in the data set.
- It is the square root of the variance.
- It is the difference between the first and third quartiles of a data set.
- It is the square of variance

**Question 8 1 pts**

Standard deviation of a normal data distribution is a _______.

- measure of data centrality
- measure of data dispersion
- measure of data shape
- measure of data quality

**Question 9 1 pts**

Which of the following is an example of a measure of dispersion?

- mean
- mode
- variance
- median

**Question 10 1 pts**

The ________ is the observation that occurs most frequently.

- mean
- mode
- outlier
- median