# (Solved): WPC 300 : Quiz 3: Descriptive Started: UPADATED Jan 26...

**WPC 300**

**Quiz 3: D**escriptive

Started: Jan 26

Quiz Instructions

**Question 1 1 pts**

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

Group of answer choices

- interquartile range
- variance
- midrange
- standard deviation

**Question 2 1 pts**

Standard deviation of a normal data distribution is a _______.

Group of answer choices

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

**Question 3 1 pts**

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

Group of answer choices

- mean
- variance
- median
- mode

**Question 4 1 pts**

Which of the following describes a positively skewed histogram?

Group of answer choices

- a histogram with large kurtosis
- a histogram that tails off towards the right
- a histogram that has no fluctuation in mass
- a histogram for which mean and mode values are the same.

**Question 5 1 pts**

According to statistical notation, what does ∑ stand for?

Group of answer choices

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

**Question 6 1 pts**

Which of the following is true for a median?

Group of answer choices

- Median can be calculated no matter how the data is arranged
- Medians are affected by outliers
- For an even number of observations, the median is the mean of the two middle numbers
- A median is only meaningful for interval or ordinal data and not for ratio data

**Question 7 1 pts**

What are the three principles of describing data?

Group of answer choices

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

**Question 8 1 pts**

The ________ is the observation that occurs most frequently.

Group of answer choices

- outlier
- mean
- mode
- median

**Question 9 1 pts**

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

Group of answer choices

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

**Question 10 1 pts**

For a normal distribution mean is _______ to median.

Group of answer choices

- less than
- not equal
- greater than
- equal