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- Fast-food restaurants are always looking for ways to cut down on expenses. Believe it or not, such restaurants may be able to decrease yearly expenses simply by decreasing the size of the paper napkins they provide to patrons. (Such a change also puts the restaurants in a more environmentally friendly position.) Papel Paper Products, a major paper company hoping to infiltrate the restaurant supply market, is considering pitching the smaller-napkin idea to potential restaurant clients. To determine the receptiveness of different restaurants to the idea, Papel surveyed 400 fast-food establishments chosen at random, and looked at the data according to two variables: type of fast-food restaurant ("burger/sandwich", "Chinese/Mexican", or "other") and attitude toward the smaller-napkin idea ("receptive" or "not receptive.") The data are summarized in the contingency table below. Each of the 6 cells of the table contains three numbers: the first number is the observed cell frequency (fO);…Why is it difficult to describe how model validation is done?A research focused on the number of illnesses involving the organism Escherichia coli (01257:H7), which causes a breakdown of red blood cells and intestinal hemorrhage in its victims. According to the Center for Disease Control of the Department of Health, an estimated 73,000 cases of E. coli infection and 61 deaths occur in Region Y. A 2028 outbreak traced to wild pigs, who spread the bacteria into a cabbage field in that , sickened 204 people in 26 municipalities. Outbreaks have occurred at a rate of 2.5 per 100,000. Let us suppose that this rate has not changed.a. What is the probability that at most five cases of E.coli per 100,000 are reported in California this year?b. What is the probability that more than five cases of E. coli are reported in California this year?c. Approximately 95% of occurrences of E. coli involve at most how many cases?
- Each year U.S. News and World Report conducts its "Survey of America's Best Graduate and Professional Schools." and ranks the top 25 business schools, as determined by reputation, student selectivity, placement success, and graduation rate. For each school, three variables were measured: (1) GMAT score for the typical incoming student; (2) student acceptance rate (percentage accepted of all students who applied); and (3) starting salary of the typical graduating student. An academic advisor wants to predict the typical starting salary of a graduate at a top business school using GMAT score of the school as a predictor variable. The results of a simple linear regression of SALARY versus GMAT using the 25 data points are shown below. Is there sufficient evidence to suggest there is a linear relationship between SALARY and GMAT at the 5% level of significance? ----------------------------------------------------------------------------------- a = -92040 b = 228 s = 3213 r2 = .66 r =…Each year U.S. News and World Report conducts its "Survey of America's Best Graduate and Professional Schools." and ranks the top 25 business schools, as determined by reputation, student selectivity, placement success, and graduation rate.For each school, three variables were measured: (1) GMAT score for the typical incoming student; (2) student acceptance rate (percentage accepted of all students who applied); and (3) starting salary of the typical graduating student. An academic advisor wants to predict the typical starting salary of a graduate at a top business school using GMAT score of the school as a predictor variable. The results of a simple linear regression of SALARY versus GMAT using the 25 data points are shown below. Is there sufficient evidence to suggest there is a linear relationship between SALARY and GMAT at the 5% level of significance? ----------------------------------------------------------------------------------- a = -92040 b = 228 s = 3213 r2 = .66 r =…Individuals involved in the criminal justice system are thought to display many dynamic criminogenic needs, meaning that they have areas of need that are specifically associated with a higher risk of offending (e.g., substance use, antisocial peers etc…). Research has demonstrated that addressing these needs in treatment can lead to reductions in committing new crimes when released from prison. A researcher thinks that offenders may also have some strengths that, if built upon, can also lead to further reductions in recidivism. The researcher has 10 incarcerated offenders take 2 assessments: one on dynamic risk factors and one on strengths (both interval scales) to see if these measures are related to each other. Using the data in Table 1 and testing at an alpha of 0.05, use all the steps of hypothesis testing to determine what can be said about the researcher’s hypothesis. Dynamic Strength 10 2 12 3 8 5 5 4 6 3 7 6 9 5 10 4 11 2 9 1
- What is a predictor-corrector method? How is it different from an embedded Runge-Kutta method?The insurance industry is one of the areas which have been highly disrupted by the emergence of artificial intelligence. For example, the underwriting process, which involves assessing the risk of insurance applicants and determining whether to provide insurance, has been predicted to become significantly faster as machine and deep learning models, powered by a dramatic increase in consumer data, facilitate the automation of the process. Discuss how the use of artificial intelligence in the underwriting process could affect the relationship between the insurer and the insurance applicants. Your explanation must refer to the following: • incomplete contracts • asymmetric informationNew "closed loop" (CL) devices have been developed to help to suppress overactive brain activity in patients with conditions such as Parkinson's disease and epilepsy.† The CL device is implanted directly into a specific area of the brain, and one of the key advantages is that it can immediately apply a treatment in reaction to heightened brain activity. This may help to reduce the duration of seizures and other periods of uncontrolled movement in patients. A study was conducted on the effectiveness of the CL device on brain activity in rats. First, each of seven rats was observed for 15 minutes with the CL device implanted but not activated (OFF). The percentage of the time that each rat was moving was recorded. Then, after each CL device was activated (CL), the percentage of the time that the rat was moving was recorded over another 15-minute period. The OFF and CL data values given in the accompanying table are approximated from a graph in the research article. The calculated…
- Apply the linear least-squares method to each set of data to obtain a mathematical model showing the relationships between variables.A study of the characteristics of subcarriers—telecommunication signals carried on top of one another—for underwater acoustic communications was conducted. A sub-carrier can be classified as either a data subcarrier (used for data transmissions), a pilot subcarrier (used for channel estimation and synchronization), or a null subcarrier (used for direct current and guard banks transmitting no signal). In a sample of 1,024 subcarrier signals transmitted off the coast of Martha’s Vineyard, 672 were determined to be data subcarriers, 256 pilot subcarriers, and 96 null subcarriers. Suppose a communications engineer who works near Martha’s Vineyard believes that fewer than 70% of all subcarrier signals transmitted in the area are data subcarriers. Is there evidence to support this belief? Test using a significance level of .05. Write all steps.Why won't the whiteboard image show up?