B1204.0o lost 19. The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call inand get answers to questions as they prepare their tax returns. In recent years, the IRShas been inundated with taxpayer calls and has redesigned its phone service as well asposted answers to frequently asked questions on its website (The Cincinnati Enquirer,January 7, 2010). According to a report by a taxpayer advocate, callers using the newzib todawell system can expect to wait on hold for an unreasonably long time of 12 minutes beforeestsmites qui being able to talk to an IRS employee. Suppose you select a sample of 50 callers afterthe new phone service has been implemented; the sample results show a mean waitingtime of 10 minutes before an IRS employee comes on the line. Based upon data from pastno board nel years, you decide it is reasonable to assume that the standard deviation of waiting timeab Iris 8 minutes. Using your sample results, can you conclude that the actual mean waitingtime turned out to be significantly less than the 12-minute claim made by the taxpayeradvocate? Use a = .05.nobslugoy

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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As the sales manager for a company manufacturing and selling standard and deluxe computer components, you have been asked by the president to prepare the following chart for the shareholders' meeting next week. Use the six-month sales report below as the database. Calculate totals as required. January February March April May June Standard Deluxe Standard Deluxe Standard Deluxe Standard Deluxe Standard Deluxe Standard Deluxe Northwest $125,200 $87,400 $117,800 $74,700 $135,400 $92,100 $138,700 $93,600 $114,900 $66,300 $137,000 $79,400 Northeast $215,700 $123,300 $229,400 $135,100 $247,600 $166,800 $240,000 $155,200 $267,100 $187,000 $280,300 $192,100 Southwest $88,300 $49,000 $72,100 $43,700 $97,700 $56,300 $104,000 $65,800 $125,000 $76,300 $130,400 $72,500 Southeast $144,200 $89,700 $150,900 $92,300 $159,400 $95,500 $128,700 $71,300 $146,700 $80,400 $163,000 $89,600
Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good barometer of the overall stock market. On January 31, 2006, 9 of the 30 stocks making up the DJIA increased in price (The Wall Street Journal, February 1, 2006). On the basis of this fact, a financial analyst claims we can assume that 30% of the stocks traded on the New York Stock Exchange (NYSE) went up the same day.A sample of 77 stocks traded on the NYSE that day showed that 26 went up.You are conducting a study to see if the proportion of stocks that went up is significantly more than 0.3. You use a significance level of α=0.10What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.)p-value = The p-value is... less than (or equal to) αα greater than αα This test statistic leads to a decision to... reject the null accept the null fail to reject…
Suppose the audience for the "Ellen Degeneres Show" was mainly LGBT people. Would this imply that these LGBT people are acting collectively?
The following is true about descriptive analysis except: Descriptive analysis describes what have already happened. Both descriptive and prescriptive analysis are used in accounting data analytics. O Prescriptive analysis is more advanced than descriptive analysis. Descriptive analysis describes what will happen in the future.
Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good barometer of the overall stock market. On January 31, 2006, 9 of the 30 stocks making up the DJIA increased in price (The Wall Street Journal, February 1, 2006). On the basis of this fact, a financial analyst claims we can assume that 30% of the stocks traded on the New York Stock Exchange (NYSE) went up the same day.A sample of 58 stocks traded on the NYSE that day showed that 21 went up.You are conducting a study to see if the proportion of stocks that went up is is significantly more than 0.3. You use a significance level of α=0.02.What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.)p-value = The p-value is... less than (or equal to) αα greater than αα This test statistic leads to a decision to... reject the null accept the null fail to…
Mid-West Publishing Company publishes college textbooks. The company operates an 800 telephone number whereby potential adopters can ask questions about forthcoming texts, request examination copies of texts, and place orders. Currently, two extension lines are used, with two representatives handling the telephone inquiries. Calls occurring when both extension lines are being used receive a busy signal; no waiting is allowed. Each representative can accommodate an average of 12 calls per hour. The arrival rate is 20 calls per hour. How many extension lines should be used if the company wants to handle 90% of the calls immediately? What is the probability that a call will receive a busy signal if your recommendation in part (a) is used? If required, round your answer to four decimal places. What number of calls, in decimal form, receive a busy signal for the current telephone system with two extension lines? If required, round your answer to four decimal places.
While reviewing the sample of audit fees, a senior accountant for the firm notes that the fee charged by the firm's accountants depends on the complexity of the return. A comparison of actual charges therefore might not provide the information needed to set next year's fees. To better understand the fee structure, the senior accountant requests a new sample that measures the time the accountants spent on the audit. Last year, the average hours charged per client audit was 3.27 hours. A new sample of 15 audit times shows the following times in hours. Complete parts a and b below. 2.9 3.8 4.3 3.9 4.2 4.7 3.7 3.3 2.5 3.6 4.5 4.2 4.7 3.1 3.3 a) Assume the conditions necessary for inference are met. Find a 90% confidence interval for the mean audit time. The 90% confidence interval to estimate the mean audit time is from to. (Round to two decimal places as needed.)
New legislation passed in 2017 by the U.S. Congress changed tax laws that affect how many people file their taxes in 2018 and beyond. These tax law changes will likely lead many people to seek tax advice from their accountants (The New York Times). Backen and Hayes LLC is an accounting firm in New York state. The accounting firm believes that it may have to hire additional accountants to assist with the increased demand in tax advice for the upcoming tax season. Backen and Hayes LLC has developed the following probability distribution for number of new clients seeking tax advice. x f(x) 20 0.05 25 0.20 30 0.25 35 0.15 40 0.15 45 0.10 50 0.10 b. What is the probability that Backen and Hayes LLC will obtain 40 or more new clients (to 2 decimals c. What is the probability that Backen and Hayes LLC will obtain fewer than 35 new clients (to 2 decimals)? d.Compute the expected value, variance, and standard deviation of (to 2 decimals). Expected value…
he Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posting answers to frequently asked questions on its website (The Cincinnati Enquirer, January 7, 2010). According to a report by a taxpayer advocate, callers using the new system can expect to wait on hold for an unreasonably long time of 15 minutes before being able to talk to an IRS employee. Suppose you select a sample of 50 callers after the new phone service has been implemented; the sample results show a mean waiting time of 13 minutes before an IRS employee comes on line. Based upon data from past years, you decide it is reasonable to assume that the standard deviation of waiting times is 11 minutes. Use alpha=.05 b. What is the p-value (to 4 decimals)?
According to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,074 in 2018. Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15). a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do early filers. Develop appropriate hypotheses such that rejection of Ho will support the researcher's contention. Но: p is - Select your answer - Ha: :µ is - Select your answer - b. For a sample of 400 individuals who filed a tax return between April 10 and 15, the sample mean refund was $910. Based on prior experience a population standard eviation of o = $1,600 may be assumed. What the p-value (to 4 decimals)? c. Using a = 0.05, can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early…
I need to see if I am doing these problems correctly. I am more of a handwritten person so if you can show me how to write these out I would appreciate it for our teacher only shows us how to use a calculator. Nationally, patients who go to the emergency room wait an average of 7 hours to be admitted into the hospital. Do patients at rural hospitals have a lower waiting time? The 15 randomly selected patients who went to the emergency room at rural hospitals waited an average of 5.9 hours to be admitted into the hospital. The standard deviation for these 15 patients was 1.4 hours. What can be concluded at the the αα = 0.05 level of significance level of significance? For this study, we should use The null and alternative hypotheses would be: H0:H0: H1:H1: The test statistic = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is αα Based on this, we should…
Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good barometer of the overall stock market. On January 31, 2006, 9 of the 30 stocks making up the DJIA increased in price (The Wall Street Journal, February 1, 2006). On the basis of this fact, a financial analyst claims we can assume that 30% of the stocks traded on the New York Stock Exchange (NYSE) went up the same day.A sample of 64 stocks traded on the NYSE that day showed that 24 went up.You are conducting a study to see if the proportion of stocks that went up is significantly more than 0.3. You use a significance level of α=0.01α=0.01.What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.)p-value = The p-value is... less than (or equal to) αα greater than αα This test statistic leads to a decision to... reject the null accept the null fail to…

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