# Construct a Frequency Distribution with 5 Classes

- 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

- Construct a frequency distribution with 5 classes.
- Create a histogram of the data using the frequency table from question 1-a.

- 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:

- How many classes are there for the given histogram?
- What is the class width of the histogram?
- What percentage of programmers can complete the task in 30 hours?
- How many hours does it take the majority of the programmers to complete the task?

- Search the Internet for prices of 11 different laptops.
- Compute the mean, median, and mode of these prices.
- Find the first and third quartiles of the prices.
- 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 hermemory usage.

- Answer the following questions completely, using proper grammar, complete sentences, and correct terminology:
- Explain what it means to have a standard deviation of 0.
- 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}
- dataset_Unit3.pdf is a sample of Web server statistics for a computer science department. It contains the following 11 sections of data:
- Total successful requests
- Average successful requests per day
- Total successful requests for pages
- Average successful requests for pages per day
- Total failed requests
- Total redirected requests
- Number of distinct files requested
- Number of distinct hosts served
- Corrupt logfile lines
- Total data transferred
- Average data transferred per day
- Write an essay of 2–3 pages that contains the following:
- A complete overview of the data, identifying anomalies in different weeks, and the weeks that the data are not regular.
- Choose 5 different sections of data, examine these sections, and provide the specific selection process and criteria you used to select this data set.
- Provide the measures of tendency and dispersion for each of the 5 different sections of data you selected.
- Provide 1 chart or graph for each of the 5 processed sections. This may be a pie or bar chart or a histogram.
- Label the chart or graph clearly.
- Explain why the graph you provided gave a good visual representation of the data.
- Based on your explanation above, identify some specific advantages why, in general, charts and graphs are important in conveying information in a visual format.
- Determine the standard deviation and variation, and explain their importance in statistical analysis of a data set.
- Based on the tasks you performed in this project, research how statistics are used in information technology (IT), and provide references for your research

Your essay should include proper citation in APA formatting, both in-text, and in reference pages. Include a title page and use 12-point Times New Roman double-spaced font throughout the text.