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l1 - STAT 350 Fall 2008 DUE Friday September 5th the...

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STAT 350 – Fall 2008 Lab #1 - SOLUTION DUE: Friday, September 5 th @ the beginning of class For the following problems, use the data in the accompanying Excel spreadsheet. This assignment is to be done using Minitab. 1. Create a frequency histogram of the data using the following cutpoints: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, and 110. 100 80 60 40 20 0 50 40 30 20 10 0 C2 Frequency 2. Based on the histogram you created, determine whether an observation of 10 would fall between 0 and 10 or between 10 and 20. There are 50 observations ranging from 1 to 9 and 58 observations ranging from 1 to 10. Clearly all the 10's are going between 10 and 20, otherwise the height of the first bar would be 58 instead of 50 3. Create a density histogram of the data using the same cutpoints as in (1). Compare to the histogram from part (1). Is one more appropriate than the other? 100 80 60 40 20 0 0.035 0.030 0.025 0.020 0.015 0.010 0.005 0.000 C2 Density The two histograms are identical except for the scale (tick mark labels) of the y-axis. But all proportions are the same. Neither one of these graphs are more appropriate than the other.
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