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

WPC 300

Quiz 3: Descriptive
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