An urban comminity would like to show that the incidence of breast cancer is higherin their area than in a nearby rural area. If it is found that 20 out of 200 adultwomen in the urban comminity have breast cancer and 20 of 300 adult womenin the rural community have breast cancer, can we conclude at the 0.025 level of1significance that breast cancer is more prevalent in the urban comminity?

The question is about hypo. testing Given : Selected no. of adult women from urban area ( n1 ) = 200…

Answered: An urban comminity would like to show…

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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In 2015, the proportion of people with Traumatic Brain Injury was 0.0062 in the United States. Periodically rehabilitation centers must demonstrate the need for rehabilitation services in their service area to receive funding from the State of Indiana. In the last survey of 348 respondents, a local rehabilitation center found the incidence of Traumatic Brain Injury in their service region to be 0.0086. The State of Indiana wants you to be 94% confident in your analysis results. State in statistical terms the null and alternative hypotheses. Determine the critical value(s). Compute the test statistic. Make a decision about the hypotheses (which hypothesis is correct?). Has Traumatic Brain Injury increased in the local area? z= (p-π)/√(π(1-π)/n)
Theorists have suggested that there may be a link between childhood trauma and involvement in the criminal justice system. These theorists think that rehabilitation for youth involved in the criminal justice system would be more effective if it targeted individual traumas in addition to known criminal risk factors. A researcher that works at one of the institutions for youth decided to test this theory choosing n=30 youth who were incarcerated and administered a questionnaire assessing their history of traumatic events. The researcher knew that youth in the general population tend to score on average a μ = 5 (the s is not known) on the interval scale measuring trauma. The researcher is unsure whether this group of offenders will scorehigher or lower and after administering the scale found the mean to be M = 7 and with a variance of s2= 4. Conduct all of the steps of hypothesis testing using an alpha = .05. (Use z-score and the normal curve table )
A study was conducted to study the association between lack of employment and depression in a population-based sample of adults in a small town. Among 5,000 adults who reported that they were unemployed 390 developed depression. Among 7,500 employed adults in the town, 58 cases of depression were observed. Construct the appropriate 2x2 table. What is the relative risk (risk ratio) of depression associated with unemployment? What is the interpretation?
The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that 77% of all fatally injured automobile drivers were intoxicated. A random sample of 53 records of automobile driver fatalities in a certain county showed that 33 involved an intoxicated driver. Do these data indicate that the population proportion of driver fatalities related to alcohol is less than 77% in Kit Carson County? Use a = 0.01. (a) What is the level of significance? State the null and alternate hypotheses. O Ho: p = 0.77; Hị: p + 0.77 O Ho: p 0.77 O Ho: p = 0.77; H1: p 5 and ng > 5. O The standard normal, since np > 5 and ng > 5. O The Student's t, since np < 5 and ng < 5. O The standard normal, since np < 5 and ng < 5. What is the value of the sample test statistic? (Round your answer to two decimal places.) (c) Find the P-value of the test statistic. (Round your answer to four decimal places.)
Last year, an engineer assigned to manage Salalah festival in which he conducted a survey for the visitors who received a tourism promotion for Salalah. Out of all people received the tourism promotion for Salalah, 60% of the promoted people visited Salalah. Due to effective marketing advertisement during the festival and the good engineering management for the event, 3s% out of the promoted people who have not visited Salalah yet, want to visit it during the coming years. At the same time, 40% of the promoted people who have been to the city, want to visit Salalah again during the coming years.
Two different areas of large eastern city are being considered as sites for day care centers. Of 200 households surveyed in one section, the proportion in which the mother worked full time was 0.52. In another section, 40 % of the 150 households surveyed had mothers working at full time jobs. At the 0.04 level of significance, is there a significant difference in the proportions of working mothers in the two areas of the city? A coal fired power plant is considering two different systems for pollution abatement .The first system has reduced the emission of the pollutants to acceptable levels 68 percent of the time, as determined from 200 air samples. The second, more expensive system has reduced the emission of pollutants to acceptable levels 76 percent of the time, as determined from 250 air samples. If the expensive system is significantly more effective than the inexpensive system in reducing pollutants to acceptable levels, then the management of the power plant will install the…
UCLA conducted a survey of more than 263,000 college freshmen from 385 colleges in fall 2005. The results of students' expected majors by gender were reported in The Chronicle of Higher Education (2/2/2006). Suppose a survey of 5,000 graduating females and 5,000 graduating males was done as a follow-up last year to determine what their actual majors were. The results for males are shown in the table below. The second column in the table does not add to 100% because of rounding.Conduct a goodness-of-fit test to determine if the actual college majors of graduating males fit the distribution of their expected majors. (Use a significance level of 0.05.) Major Men - Expected Major Men - Actual Major Art & Humanities 11.0% 600 Biological Sciences 6.7% 330 Business 22.7% 1,130 Education 5.8% 305 Engineering 15.6% 800 Physical Sciences 3.6% 175 Professional 9.3% 460 Social Sciences 7.6% 370 Technical 1.8% 90 Other 8.2% 400 Undecided 6.6% 340 Part (a)…
A research center claims that more than 37% of U.S adults eat breakfast everyday. In a random sample of 300 U.S adults, 123 said they eat breakfast everyday. At 0.10 level of significance, what can you conclude about the researchers claim?
A sample of n = 25 diners at a local restaurant had a mean lunch bill of $16 with a standard deviation of o = $4. We obtain a 95% confidence interval as (14.43, 17.57). Which of the following correctly interprets this interval? • a. 95% of all lunches will cost between $14.43 and $17.57. • b. 95% of the time, the average price for a lunch will be between $14.43 and $17.57. • c.None of the answer options is correct.
Hi! help me with this please. TYSM! In a study by the United Dairy IndustryAssociation, 42% of 655 persons age 35–44 said theyseldom or never ate cottage cheese. For 455 individualsage 45–54, the corresponding percentage was 34%. At the0.01 level, can we reject the possibility that the populationpercentages could be equal for these two groups?
A recent PwC survey of 1,379 CEOs from a wide range of industries representing a mix of company sizes from Asia, Europe, and the Americas indicated that CEOs are firmly convinced that it is harder to gain and retain people's trust in an increasingly digitalized world (pwc.to/2jFLzjF). Fifty-eight percent of CEOs are worried that lack of trust in business would harm their company's growth. Which risks arising from connectivity concern CEOs most? Eighty-seven percent believe that social media could have a negative impact on the level of trust in their industry over the next few years. But they also say new dangers are emerging and old ones are getting worse as new technologies and new uses of existing technologies increase rapidly. CEOs are particularly anxious about breaches in data security and ethics and IT outages and disruptions. A vast majority of CEOs are already taking steps to address these concerns, with larger-sized companies doing more than smaller-sized companies. a.…
To investigate if female executives in a very large fortune 500 company are experiencing pay-discrimination: A researcher samples the incomes of 300 male and 300 female executives from that corporation. 1.) Which statistic would you use to test the income difference between male and female executives? 2.) What additional information do you need to calculate this statistic?

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