Purdue STAT 350 Lab 2 Describing Distributions with Graphs and Numbers Answer (2018)
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STAT 350 Lab 2 Describing Distributions with Graphs and Numbers Solution (2018) - Purdue University
A. (10 points) Online Prelab
B (45 pts) Average Test Scores (Data Set: USData cleaned) We are interested in the graphical and numeric summaries for the adjusted average test score for a college admission exam (TestScore).
1. (10 points) Code. The code is the script (commands) either in R or in the Editor in SAS. Remember that you need to include the code or procedure for inputting the data into your software package.
2. (2 points) Find the five-number summary for these data.
3. (5 points) Calculate the 1.5 IQR upper and lower limits for the outliers. Are there any outliers according to the 1.5 IQR rule (just answer yes or no, and explain why you know)? This part may be done by hand. If done by hand, all work needs to be provided. If done via computer code, then the code must be listed.
4. (5 points) Make a modified boxplot. Describe the distribution by stating whether it is symmetrical, left, or right skewed, and if there are outliers. Please indicate which features of the plot you used to classify the type of skewness and determine whether outliers are present.
5. (5 points) Make a histogram of the data. Describe the distribution by stating whether it is symmetrical, left, or right skewed, and if there are outliers. Please indicate which features of the plot you used to classify the type of skewness and determine whether outliers are present.
6. (5 points) Are the data points you considered outliers in the histogram and the boxplot the same or different? If they are different, please provide a possible explanation for the difference.
7. (5 points) Obtain the sample mean,
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