A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be aquality credit risk. According to a survey, the mean credit score is 702.4. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. Heobtained a random sample of 41 high-income individuals and found the sample mean credit score to be 721.3 with a standard deviation of 80.9. Conduct the appropriate test to determine if high-incomeindividuals have higher credit scores at the a= 0.05 level of significance.State the null and alternative hypotheses.Ho HH₁ H(Type integers or decimals. Do not round.)Identify the t-statistic.to = (Round to two decimal places as needed.)Identify the P-value.P-value= (Round to three decimal places as needed.)Make a conclusion regarding the hypothesis.the null hypothesis. Theresufficient evidence to claim that the mean credit score of high-income individuals is

Answered: ality credit risk. According to a…

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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4. A surgeon is experimenting with a new technique for implanting artificial blood vessels. Using this technique, the mean time for clotting of artificial blood vessel has been 32.5 days with a standard deviation of 2.6 days. How long would a vessel have to stay open to be in the 95th percentile?
According to a recent report from the U.S. National Center for Health Statistics, females between 25 and 34 years of age have a bell-shaped distribution for height, with mean of 65 inches and standard deviation of 3.5 inches. Between what values would you expect 95% of the heights to fall? What is the height for a female who is 3.5 standard deviations below the mean? Would this be an unusual height? Why or why not? ****I am unsure on how to actually set this formula up. Please assist
2. Hypothesis: A one hour GRE workshop increases test scores. Sample Data: Mean of 25 people who did workshop = 156 (standard deviation = 8.2); mean of 27 people who did not do workshop = 154 (standard deviation 7.6).
The National Coalition on Healthcare suggests that the mean annual premium that a health insurer charges an employer for a health plan covering a family of four averaged $13,000 in 2009. A sample of 30 families of four yields a mean annual premium paid by their employer to be $13,500 with a sample standard deviation of $300. We are interested in whether the mean annual premium that a health insurer charges an employer for a health plan covering a family of four is different from $13,000 using a significance level of 0.10. Select one: a. tdata = 9.129, do not reject Ho. b. tdata = 9.129, reject Ho. c. tdata = -9.129, do not reject Ho. O d. tdata = 4.156, reject Ho.
An article in the San Jose Mercury News stated that students in the California state universitysystem take 4.25 years, on average, to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of 64 students and obtain a sample mean of 4.5 with a sample standard deviation of 1.5. Do the data support your claim at the 1% level?
An alumni association wants to estimate the mean debt of this year's college graduates. It is known that the population standard deviation of the debts of this year's college graduates is $11,800. How large a sample should be selected so that the estimate with a 99% confidence level is within $800 of the population mean?
A study shows that Michigan teachers have measures of job dissatisfaction that are normally distributed with a mean of 3.80 and standard deviation of 0.95. If subjects with scores above 4.0 are to be given more tests, what percentage will fall into that category?
A course has a midterm (average 70; standard deviation 10) and a really hard final (average 50; standard deviation 12) If the scatter diagram comparing midterm & final scores for students has an oval shape with correlation 0.75, then... What do you expect the average final score would be for students who scored 75 on the midterm?
An alumni association wants to estimate the mean debt of this year's college graduates. It is known that the population standard deviation of the debts of this year's college graduates is $11,800. How large a sample should be selected so that the estimate with a 99% confidence level is within $800 of the population mean?
The average time taken for your Internet service provider to remotely resolve a trouble ticket has a Normal distribution with a mean of 4.3 hours and a standard deviation of 3.1 hours. What percent of the time can you expect to wait longer than a full 8-hour business day for a resolution?
At the end of 2015, 2016, and 2017, the average prices of a share of stock in a portfolio were $34.83, $34.65, and $31.26 respectively. To investigate the average share price at the end of 2018, a random sample of 30 stocks was drawn and their closing prices on the last trading day of 2018 were observed with a mean of 33.583 and a standard deviation of 19.149. Estimate the average price of a share of stock in the portfolio at the end of 2018 with a 95% confidence interval. Compare and Briefly discuss
As the manager of the human resources department at your firm, you are investigating the number of sick days employees took during the last calendar year. For employees in the marketing area, the average number of sick days is 4.8 with standard deviation 1.9; for those in the research and design (R&D), the mean is 5.5 with standard deviation 3.2. Compute and compare the coefficients of variation for each set of data. What is the coefficient of variation for the marketing area? CV=? % (Round to one decimal place as needed.) What is the coefficient of variation for the research and design (R&D) area? CV= ?% (Round to one decimal place as needed.) Which area of the firm has more variability?

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