1. Introductory Statistics: Exploring the World through Data, 1e
Active Learning Lecture Slides
For use with Classroom Response Systems
Introductory Statistics:
Exploring the World through Data, 1e
by Gould and Ryan
Quiz on 3.4 & 4.5
© 2013 Pearson Education, Inc.

2. © 2013 Pearson Education, Inc.
True or False The median cuts a distribution down the middle, so about 50% of the observations are below it and about 50% are above it.
True
False
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3. Which of the following is are true?
Use the mean and standard deviation when the distribution is mound shaped.
Use the Median and IQR when the distribution is skewed left or skewed right.
If the distribution is not unimodal, it may be better to split the data.
All of the above.
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4. © 2013 Pearson Education, Inc.
True or False In a symmetric distribution, the mean and median are approximately the same.
True
False
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5. © 2013 Pearson Education, Inc.
In a right skewed distribution, the median tends to be greater than the mean.
True
False
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6. © 2013 Pearson Education, Inc.
An outlier
is a value so large or small that it does not fit the pattern of the other data.
has no precise definition.
can be caused by mistakes in data entry.
All of the above.
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7. When an outlier is present,
the mean is usually not affected.
the median is usually not affected.
the mean does not change even if a particular outlier is replaced by an even more extreme value.
All of the above.
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8. © 2013 Pearson Education, Inc.
When comparing two distributions, it’s okay to use different measures of spread as long as the researcher is careful about the interpretation
True
False
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9. © 2013 Pearson Education, Inc.
Boxplots are a useful graphical tool for comparing two or more groups of data.
True
False
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10. © 2013 Pearson Education, Inc.
What is the median of the distribution represented in the boxplot below? 74 83 85 92 94
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11. The numbers given in the Five Number summary are
Mean, standard deviation, variance, outliers, zscore.
Minimum, mean, standard deviation, maximum, outlier
Q1, IQR, Q3, outlier, standard deviation
Minimum, Q1, median, Q3, maximum
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