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Created: Feb 1, 2017
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Rubio-Bautista, Yesica, Lab 3
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1. Tell which graph for Homework you found the most useful. Why? Address each graph and indicate what you found useful or lacking in each one. 

^The graph I found the most useful would definitely be the: Histogram because it is the most straight forward, demonstrates a great visual, and it is easier to see what the results are. The Stem and Leaf plot is confusing for me as to what the results are. The Dot Plot shows more representation to what side it leans to the most 'score' wise . Lastly, the Box Plot is the prettiest with the most awkward shaped, but does demonstrate the scores well enough to understand which category has the highest score. 

2. What is the shape of the histogram? Is the shape something you expected (or would expect) for homework grades, why or why not? Do you think every college class has the same type of distribution? Why or why not? 

^The Histogram's shape is: skewed left. No it is not what I expected, the scores are spreaded across meaning the scores are everywhere. I thought the grades where going to be consistent resulting into a symmetrical Histogram. Oh yes, the other classes I believe would have the same results as we did because there will always be low and high scores.  

3. Using the side-by-side boxplots for grades, describe the shape of the distribution for the Lab scores. Are there any outliers for either set of scores? If so, indicate the score(s) of the outlier(s) for each. Using the IQR, which set of scores has more dispersion? Explain why you think that might be? 

^In the Box Plot for the grades in the lab would be skewed left. There are three outliers in the lab scores "between 65-78" and one outlier for the homework scores at around "53". Obviously, the homework scores have more of spread due to the reason that we have much more homework assignments than lab assignments, therefore, there is more room for change in scores.  

4. Lastly, calculate your z-score for the homework. You may use your current average homework score, as currently listed in MyStatLab. Type the full calculation, with the values you used, for full credit. Any answer without work shown will receive partial credit, at best. 

[z= (x- x‾) ÷ SD ] 

z = (my score) - (class mean score) ÷ Standard Deviation  

z = (100.00 - 88.225789) ÷ 11.070777 

z = 1.063539714 

5. Refer to z-score calculated in #4: What does your z-score mean? Are you satisfied with your z-score? Why or why not? 

- My z score means that my grade is 1.063539714 points away from the class mean. But I believe I did my calculations wrong because it does not look correct. Overall, I am satisfied with my score, since it obviously is a passing grade.

Result 1: Histogram: Math 134 (Section 5549) Spring 2017 Grades by Y. Rubio-Bautista   [Info]
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Result 2: Stem and Leaf Plot: Math 134 Spring 2017 Homework Grades by Y. Rubio-Bautista   [Info]
Variable: Homework

Decimal point is 1 digit(s) to the right of the colon.
Leaf unit = 1
 5 : 2
 5 : 
 6 : 
 6 : 6
 7 : 12
 7 : 6789
 8 : 01111
 8 : 58
 9 : 011112334
 9 : 567778999
10 : 00000

Result 3: Dotplot: Math 134 Year 2017, Spring Semester Homework Grades by Y. Rubio-Bautista   [Info]
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Result 4: Boxplot: Math 134 (Section 5549) Year 2017, Spring Semester Lab & Homework Grades by Y. Rubio-Ba   [Info]
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Result 5: Summary Stats: Math 134 (Section 5549) Year 2017, Spring Semester Homework & Lab Grades by Y. Ru   [Info]
Summary statistics:
ColumnnMinQ1MedianQ3MaxIQRMeanUnadj. std. dev.
Homework3852.3380.7591.41597.4510016.788.22578911.070777
Labs38093.331001001006.6792.98236817.701049

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<A href="https://www.statcrunch.com/5.0/viewreport.php?reportid=66239">Rubio-Bautista, Yesica, Lab 3</A>

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