# (Solved): WPC 300 Assignments Quiz 7 ( Quiz Score: 15 out of 15 )...

** Assignments
Quiz 7
WPC 300**

**Question 1**

1.5 / 1.5 pts

According to statistical notation, what does ∑ stand for?

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

**Question 2**

1.5 / 1.5 pts

For a normal distribution mean is _______ to median.

- not equal
- greater than
- less than
- equal

**Question 3**

1.5 / 1.5 pts

Which of the following describes a positively skewed histogram?

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

**Question 4**

1.5 / 1.5 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 difference between the first and third quartiles of a data set.
- It is the square root of the variance.
- It is the square of variance

**Question 5**

1.5 / 1.5 pts

Which of the following is true for a median?

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

**Question 6**

1.5 / 1.5 pts

Which of the following is an example of a sample?

- 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
- The population of Canada

**Question 7**

1.5 / 1.5 pts

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

- standard deviation
- midrange
- interquartile range
- variance

**Question 8**

1.5 / 1.5 pts

Standard deviation of a normal data distribution is a _______.

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

**Question 9**

1.5 / 1.5 pts

What are the three principles of describing data?

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

**Question 10**

1.5 / 1.5 pts

The ________ is the observation that occurs most frequently.

- outlier
- mean
- mode
- median

Quiz Score: **15 **out of 15