sec-9-3-worksheet.pdf

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Question (3): Use your answer from question (2), to describe the sensitivity of the mean . In other words, how easy is it to change?

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Question (4): Write the data above in descending order. Since there are an even number of data, find the two middle data points. Take their mean. What you just found is called the median . Question (5): How would you have changed the process for finding the median if the data set contained an odd number of data points? Question (6): Is your median above or below the mean you found in question (1), or is it about the same? Interpret what this means for the above data set. ( HINT: For your interpretation, it might be helpful to look up the word skewed in your textbook.) Question (7): Which number(s) occur most often? These are your mode(s) . When do we most often use the mode, and what does it tell us? In this next section of questions, we will introduce measures of variability . These measures tell us how a data set varies from its center, or its spread . Questions 8-12 will deal directly with quartiles, while the last few questions will deal with variance and standard deviation.
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