The file Mobilespeed contains the overall download and upload speeds in mbps for nine carriers in the U.S.

a. Compute the covariance between download speed and upload speed.

b. Compute the coefficient of correlation between download speed and upload speed.

c. Based on (a) and (b), what conclusions can you reach about the relationship between download speed and upload speed?

Consider the feedback system in Figure Develop an m-file to design a controller and prefilter

$$G_c(s)=K \frac{s+z}{s+p} \text { and } \quad G_p(s)=\frac{K_p}{s+\tau}$$

such that the ITAE performance criterion is minimized. For $\omega_n=0.45$ and $\zeta=0.59$, plot the unit step response and determine the percent overshoot and settling time.

For this exercise, describe in words each set.

Let

$U=$ the set of all tax returns in the file,

$A=$ the set of all tax returns with itemized deductions,

$B=$ the set of all tax returns showing business income,

$C=$ the set of all tax returns filed in $2014$,

$D=$ the set of all tax returns selected for audit.

$$(A \cup B)-D$$

Write a program that produces a bar chart showing the population growth of Prairieville, a small town in the Midwest, at 20-year intervals during the past 100 years. The program should read in the population figures (rounded to the nearest 1,000 people) for 1910, 1930, 1950, 1970, 1990, and 2010 from a file. For each year it should display the date and a bar consisting of one asterisk for each 1,000 people. The data can be found in the People.txt file located in the Chapter 5 programs folder on the book’s companion website.

Here is an example of how the chart might begin:

PRAIRIEVILLE POPULATION GROWTH
(each * represents 1000 people)

1910     **
1930     ****
1950     *****

1. Search the Java Web site for information on how to use a JTextArea. Write an application for the WebBuy Company that allows a user to compose the three parts of a complete e-mail message: the “To:”, “Subject:”, and “Message:” text. The “To:” and “Subject:” text areas should provide a single line for data entry. The “Message:” area should allow multiple lines of input and be able to scroll if necessary to accommodate a long message. The user clicks a button to send the e-mail message. When the message is complete and the Send button is clicked, the application should display “Mail has been sent!” on a new line in the message area. Save the file as JEMail.java.

2. Modify the JEMail application to include a Clear button that the user can click at any time to clear the “To:”, “Subject:”, and “Message:” fields. Save the file as JEMail2.java.

Hopper and Seeman (1994) studied the relationship between bone density and smoking among 41 pairs of middle-aged female twins. In each pair, one twin was a lighter smoker and one a heavier smoker, as measured by pack-years, the number of packages of cigarettes consumed in a year. Bone mineral density was measured at the lumbar spine, the femoral (hip) neck, and the femoral shaft. As well as smoking, other variables, such as alcohol consumption and tea and coffee consumption, were recorded. The data are contained in the file bonden and documentation is in the file bonedendoc. Use graphical methods to compare bone densities of the heavy and light smoking twins. Do any of the other variables bear a relationship to bone density? After completing your analysis, you may wish to compare your conclusions to those in the paper.

Test your understanding of the financial statements by answering the following questions. Select the best choice from among the possible answers given.

All of the following are current assets except a. prepaid expenses. b. accounts payable. c. inventory. d. accounts receivable.

(Count clients) Write a server that tracks the number of the clients connected to the server. When a new connection is established, the count is incremented by 1. The count is stored using a random-access file. Write a client program that receives the count from the server and displays a message, such as “You are visitor number 11”. Name the client Exercise33_04Client and the server Exercise33_04Server.

At the command prompt, type cat /etc/nsswitch.conf and press Enter to view the /etc/ nsswitch.conf file. Next, type cat /etc/nsswitch.conf | less at the command prompt and press Enter to perform the same task page-by-page. Explain what the | metacharacter does in the previous command. How is this different from the less /etc/nsswitch.conf command?

Trevor Moore opened a law office on April 1, 2017. During the first month of operations, the business completed the following transactions:

Apr. 1. Moore contributed $76,000 cash to the business, Trevor Moore, Attorney. The business issued common stock to Moore. 3. Purchased office supplies,$400, and furniture, $2,200, on account. 4. Performed legal services for a client and received$900 cash. 7. Purchased a building with a market value of $120,000, and land with a market value of$29,000. The business paid $45,000 cash and signed a note payable to the bank for the remaining amount. 11. Prepared legal documents for a client on account,$800. 15. Paid assistant's semimonthly salary, $1,230. 16. Paid for the office supplies purchased on April 3 on account. 18. Received$2,800 cash for helping a client sell real estate. 19. Defended a client in court and billed the client for $1,500. 25. Received a bill for utilities,$650. The bill will be paid next month. 28. Received cash on account, $1,700. 29. Paid$4,800 cash for a 12-month insurance policy starting on May 1. 29. Paid assistant's semimonthly salary, $1,230. 30. Paid monthly rent expense,$1,100. 30. Paid cash dividends of $2,000.

Requirements

1. Record each transaction in the journal, using the following account titles: Cash; Accounts Receivable; Office Supplies; Prepaid Insurance; Furniture; Building; Land; Accounts Payable; Utilities Payable; Notes Payable; Common Stock; Dividends; Service Revenue; Salaries Expense; Rent Expense; and Utilities Expense. Explanations are not required.
2. Open the following four-column accounts including account numbers: Cash, 101; Accounts Receivable, 111; Office Supplies, 121; Prepaid Insurance, 131; Furniture, 141; Building, 151; Land, 161; Accounts Payable, 201; Utilities Payable, 211; Notes Payable, 221; Common Stock, 301; Dividends, 311; Service Revenue, 411; Salaries Expense, 511; Rent Expense, 521; and Utilities Expense, 531.
3. Post the journal entries to four-column accounts in the ledger, using dates, account numbers, journal references, and posting references. Assume the journal entries were recorded on page 1 of the journal.
4. Prepare the trial bal.ance of Trevor Moore, Attorney, at April 30, 2017.

During the current month, the following errors occurred in recording transactions in the purchases journal or in posting from it. d. The Accounts Payable column of the purchases journal was overstated by $3,600. How will each error come to the bookkeeper’s attention, other than by chance discovery?

The file sizes, in megabytes, of 30 songs on an MP3 player are shown below. If you make a histogram using intervals of 50-59, 60-69, 70-79, 80-89, and 90-99, which interval has the greatest bar?

50,99,98,58,61,70,86,51,65,73,81,97,50,66,76,83,55,67,78,90,54,52,63,73,77,92,76,55,60,66

A 50-59

B 60-69

C 70-79

D 80-89

Employment in Older Workers. Older people often have a hard time finding work. AARP reported on the number of weeks it takes a worker aged 55 plus to find a job. The data on number of weeks spent searching for a job contained in the file JobSearch are consistent with the AARP findings.

b. At $95 \%$ confidence, what is the margin of error?

Stock Market Indexes Comparison. The Russell 1000 is a stock market index consisting of the largest U.S. companies. The Dow Jones Industrial Average is based on 30 large companies. The file Russell gives the annual percentage returns for each of these stock indexes for the years 1988 to 2012 (1Stock1 website).

a. Plot these percentage returns using a scatter plot.