# Construct a frequency distribution with 5 classes.

1. In a survey, 24 IT professionals in Chicago were asked how much their annual salary was for the year 2012. The results are shown below:
\$109,000  \$ 65,000  \$ 65,000  \$ 59,000  \$ 180,000  \$ 101,325   \$ 130,000  \$95,000  \$ 81,500  \$69,000  \$71,500  \$ 74,880   \$64,000  \$72,000   \$ 71,000  \$ 82,300  \$49,000  \$51,200   \$ 39,000  \$48,500  \$64,330   \$ 41,100  \$52,330  \$82,000

1. Construct a frequency distribution with 5 classes.
2. Create a histogram of the data using the frequency table from question 1-a.
2. A software company asked 100 of its programmers to develop a certain program individually. The following histogram shows the time it takes a programmer to finish the task:
1. How many classes are there for the given histogram?
2. What is the class width of the histogram?
3. What percentage of programmers can complete the task in 30 hours?
4. How many hours does it take the majority of the programmers to complete the task?
3. Search the Internet for prices of 11 different laptops.
1. Compute the mean, median, and mode of these prices.
2. Find the first and third quartiles of the prices.
4. In the following image, the memory usage of various processes of a computer running a Windows Operating System is shown:
• Create a scatter plot of the memory usage of the processes.
• Find the following measures of central tendency of the memory usage in kilobytes (Kb):
• Mean
• Mode
• Median
• Find the following measures of dispersion of the memory usage in Kb:
• Range
• Variance
• Standard Deviation
• Identify the values that are responsible for the variance of the dataset. Provide a possible solution on how the computer user could decrease the variance of his or her memory usage.
5. Answer the following questions completely, using proper grammar, complete sentences, and correct terminology:
1. Explain what it means to have a standard deviation of 0.
2. Without doing any calculations, is it possible to tell which of the following 2 sets has a higher standard deviation? Explain your answer.
• Set 1 = {1,2,3,4,5,6,7,8}
• Set 2 = {2,4,6,8,10,12,14,16}

Project Criteria Exceeds: 90%–100% Very Good: 80%–89% Meets: 70%–79% Needs Improvement: Below 70%

Content
(75%)

Response covers all topics indicated in the assignment and adds additional content.  Response covers most topics indicated in the assignment.  Response covers many of the topics indicated in the assignment. Response covers none to some of the topics indicated in the assignment.

Effective Communication
(10%)

Demonstrates outstanding or exemplary application of written, visual, or oral skills. Demonstrates outstanding expression of topic, main idea, and purpose. Audience is addressed appropriately. Language clearly and effectively communicates ideas and content relevant to the assignment. Errors in grammar, spelling, and sentence structure are minimal. Organization is clear. Format is consistently appropriate to assignment. Presentation and delivery are confident and persuasive (where applicable). The writing was of collegiate level with no errors in spelling or grammar. Demonstrates very good written, visual, or oral skills. Demonstrates sound expression of topic, main idea, and purpose. Audience is usually addressed appropriately. Language does not interfere with the communication of ideas and content relevant to the assignment. Errors in grammar, spelling, and sentence structure are present, but do not distract from the message. Organization is apparent and mostly clear. Format is appropriate to assignment, but not entirely consistent. The writing was of collegiate level with two or less errors in spelling or grammar. Demonstrates acceptable written, visual, or oral skills. Demonstrates reasonable expression of topic, main idea, and purpose. Sometimes, audience is addressed appropriately. Language does not interfere with the communication of ideas and content relevant to the assignment. Errors in grammar, spelling, and sentence structure are present and may distract from the message. Organization is a bit unclear. Format is inconsistent. The writing was of collegiate level with several errors in spelling or grammar. Demonstrates inadequate or partially proficient application of written, visual, or oral skills. Demonstrates inadequate or partial expression of topic, main idea, and purpose. Audience is often not addressed appropriately. Language often impedes the communication of ideas and content relevant to the assignment. Errors in grammar, spelling, and sentence structure are frequent and often distract from meaning or presentation. Organization is inadequate, confusing, and distracting. The format is inadequate and obscures meaning. The writing was less than collegiate level with numerous errors in spelling or grammar.

Supporting Analysis
(15%)

Analysis exceeds minimum requirements. Sources are used to support analysis, are appropriate, and are properly referenced. Basic analysis provided to support assertions. Sources are cited, appropriate, and properly referenced. Limited analysis provided to support assertions. Some sources are cited, appropriate, and properly referenced. No or inaccurate analysis, no sources are cited when needed, analysis and/or sources are not appropriate. When sources are used, they are not properly referenced.

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