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(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


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