(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