# (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 ____________.

• interquartile range
• variance
• midrange
• standard deviation

Question 2                         1 pts
Standard deviation of a normal data distribution is a _______.

• 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?

• mean
• variance
• median
• mode

Question 4                                  1 pts
Which of the following describes a positively skewed histogram?

• 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?

• 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?

• 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?

• Centrality, dispersion and size
• Dispersion, range and standard deviation
• Mean, median and mode

Question 8                      1 pts
The ________ is the observation that occurs most frequently.

• outlier
• mean
• mode
• median

Question 9                    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 10                     1 pts
For a normal distribution mean is _______ to median.

• less than
• not equal
• greater than
• equal

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