The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the average proportion of correctresponses has been 70 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were again asked of 20randomly selected IRS telephone representatives. The proportions of correct answers were:16, 15, 19, 9, 17, 21, 21, 16, 17, 16, 23, 20, 22, 19, 21, 16, 23, 15, 21, and 15.a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z = 3.The UCL, equals and the LCL, equals (Enter your responses rounded to four decimal places. If your answer for LCL is negative, enter this value as 0.)

The formula to constructing the control limits for the p - chart is defined as follows…

Answered: The IRS is concerned with improving the…

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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Read the following on attendance and grades, and answer the questions. A study revealed that students from a certain local college in Bulacan who attended class 95 to 100% of the time usually received a grade of 1.0 in the class. Students who attended class 80 to 90% of the time usually received a 1.5 or 1.75 in the class. Students who attended class less than 80% of the time usually received a 3 or a 5 or eventually withdrew from the class. Many factors affect a student’s grade in a course. One factor that has considerable control over is attendance. One can increase the opportunities for learning by attending class more often. 1. What are the variables under study? Answer: 2. Which are the dependent and independent variables in the study? Answer: 3. Categorize each variable as quantitative or qualitative. Answer: 4. Categorize each quantitative variable as discrete or continuous. Answer: 5. Identify the level of measurement for each variable. Answer: 6. Are descriptive,…
The FBI wants to determine the effectiveness of their 10 Most Wanted list. To do so, they need to find out the fraction of people who appear on the list that are actually caught. Step 1 of 2 : Suppose a sample of 716 suspected criminals is drawn. Of these people, 279 were captured. Using the data, estimate the proportion of people who were caught after being on the 10 Most Wanted list. Enter your answer as a fraction or a decimal number rounded to three decimal places.
A programmer plans to develop a new software system. In planning for the operating system that he will use, hee needs to estimate the percentage of computers that use a new operating system. How many computers must be surveryed in order to be 90% confident that his estimate is in error by no more than one percentage point. Complete part (a) through (c) below. a. n= b Assummer that a recent survey suggests that about 86% of computers use a new operating system. c. Does the additional survey information from part (b) have much of an effect on the sample size that is required?
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The Humane Society is interested in finding out how many households in America have at least one cat. How many households must be surveyed to be 95% confident that the estimate will be within 4% of the true population percentage?
The IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the average proportion of correct responses has been 72 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were again asked of 20 randomly selected IRS telephone representatives. The proportions of correct answers were: 21, 20, 19, 16, 22, 15, 21, 15, 17, 15, 24, 17, 24, 21, 18, 16, 23, 16, 21, and 20. a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z = 3. The UCL, equals and the LCLp equals ☐ . (Enter your responses rounded to four decimal places. If your answer for LCLp is negative, enter this value as 0.)
The state education commission wants to estimate the fraction of tenth-grade students that have reading skills at or below the eighth-grade level. Step 1 of 2 : Suppose a sample of 1134 tenth graders is drawn. Of the students sampled, 226 read at or below the eighth-grade level. Using the data, estimate the proportion of tenth graders reading at or below the eighth-grade level. Enter your answer as a fraction or a decimal number rounded to three decimal places.
Read the following on attendance and grades, and answer the questions. A study revealed that students from a certain local college in Bulacan who attended class 95 to 100% of the time usually received a grade of 1.0 in the class. Students who attended class 80 to 90% of the time usually received a 1.5 or 1.75 in the class. Students who attended class less than 80% of the time usually received a 3 or a 5 or eventually withdrew from the class. Many factors affect a student’s grade in a course. One factor that has considerable control over is attendance. One can increase the opportunities for learning by attending class more often. a. From the information given, comment on the relationship between the variables Answer: b. What type of survey do you think is most appropriately used for the study? Answer: c. Do you think the use a random method for deciding who would be in the sample is appropriate? Why? Answer:
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During the first 13 weeks of the television season, the Saturday evening 8:00 PM to 9:00 PM audience proportions were recorded as ABC 29%, CBS 26%, NBC 24%, and Independents 21%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following viewing audience data: ABC 93 homes, CBS 68 homes, NBC 87 homes, and independents 52 homes. Test with a .05 to determine whether the viewing audience proportions changed. Round your answers to two decimal places. Test statistic 6.76 ✔ p-value is between between 05 and.101 Conclusion: There is no significant change in the viewing audience proportions.
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According to US Census data for 2010 the percentage of Americans in living in Urban areas was approximately 80.7%. Apply this percentage to both the 2000 and 2012 total sample size and estimate the number of Urban respondents in each survey. For 2000 number of population is 43093 and 2012 is 36309..

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