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# (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

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
• 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

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