# HW_03_04 - ECO220Y: Homework, Lectures 3 &amp; 4 Readings:...

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Page 1 of 3 ECO220Y: Homework, Lectures 3 & 4 Readings: Sections 2.2 – 2.6 Exercises: 2.86 (by hand) Problems: (1) Using the descriptive terms for histograms given in lecture, how would you describe the graph below? Roughly how many observations are negative? 0 .01 .02 .03 .04 Density -10 0 10 20 30 40 X n: 228 (2) Using the descriptive terms for histograms given in lecture, how would you describe the graph below? Roughly how many observations are negative? Roughly how many zeros are there in the data? 0 .1 .2 .3 .4 0 2 4 6 8 X n: 62 (3) Using the descriptive terms for scatter diagrams given in lecture, how would you describe the graphs below? What is the approximate slope in each? -20 0 20 40 60 y3 0 1 2 3 4 5 x 2 4 6 8 y4 0 1 2 3 4 5 x

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Page 2 of 3 (4) Consider the following tabulation. (These are the same data on hour of work that we considered in Lecture 2.) As summaries of these data, compare and contrast this tabulation with the histograms given in Lecture 2. hours |
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## HW_03_04 - ECO220Y: Homework, Lectures 3 &amp; 4 Readings:...

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