Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for the Vanguard Total Stock Index (all Stocks) Let ya random variable representing annual return for the Vanguard Balanced Index (60% stock and 40% bond). For the past several years, assume the following data. Compute a 75%Chebyshev interval around the mean for x-values and also for y-values. Round your answers to the nearest hundredth.13362234 24 25 13 -13-2210-5261623. 17 16-6-10O for x-values: -10 20 to 52.20 and for y-values -S 21 to 35.02O for x-values -31.00 to 24.01 and for y-values-18.62 to 21.61O for x-values -31.00 to 52 20 and for y-values -18.62 to 35.02O for x-values -31.00 to 24.01 and for y-values -5.21 to -16 22O for x values -18.62 to 35.02 and for y-values-31.00 to 52.20

Chebyshev's theorem: At least 75% of the observations are lies between two standard deviations,…

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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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Current Attempt in Progress How Many Birds Do Domestic Cats Kill? "Domestic cats kill many more wild birds in the United States than scientists thought," states a recent article.1 Researchers useda sample of n = 140 households in the US with cats to estimate that 35 % of household cats in the US hunt outdoors. A separate study? used KittyCams to record all activity of n = 55 domestic cats that hunt outdoors. The video footage showed that the mean number of kills per week for these cats was 2.4 with a standard deviation of 1.51. Find a 90 % confidence interval for the mean number of kills per week by US household cats that hunt outdoors. Round your answers to three decimal places. The 90 confidence interval is
+ 十 6. 8. 6. 10 11 12 13 14 15 16 data Based on the boxplot above, identify the 5 number summary (min, Q1, median, Q3, max) IQR = %3D
Table attached shows the historical returns for Companies A, B and C Estimate the average return and standard deviation of each company. Estimate the correlations between Company A and B, A and C, as well as B and C.
← A boat capsized and sank in a lake. Based on an assumption of a mean weight of 146 lb, the boat was rated to carry 70 passengers (so the load limit was 10,220 lb). After the boat sank, the assumed mean weight for similar boats was changed from 146 lb to 174 lb Complete parts a and b below. a. Assume that a similar boat is loaded with 70 passengers, and assume that the weights of people are normally distributed with a mean of 177.5 lb and a standard deviation of 38.1 lb. Find the probability that the boat is overloaded because the 70 passengers have a mean weight greater than 146 lb The probability is (Round to four decimal places as needed)
Hz A certain brokerage house wants to estimate the mean daily return on a certain stock. A random sample of 19 days yields the following return percentages. -2.4, -2.64, 0.75, 1.96, 0.25, -2.17, 1.74, 2.59, 2.97,-0.86, -2.55, -0.72, -1.33, -0.95, -1.73, 2.49, 0.82, 0.15, -2.18 Send data to calculator Send data to Excel If we assume that the returns are normally distributed, find a 90% confidence interval for the mean daily return on this stock. Give the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: Upper limit: I Don't Know Submit X 3 O Search e acer Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use * X
Listed in the accompanying table are waiting times (seconds) of observed cars at a Delaware inspection station. The data from two waiting lines are real observations, and the data from the single waiting line are modeled from those real observations. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b). One Line Two Lines 64.1 733.6 64.3 865.2 157.2 605.8 215.8 1089.7 142.2 267.8 85.6 662.7 278.9 310.2 339.6 518.1 253.2 128.8 199.5 565.6 475.7 132.9 630.3 268.2 478.2 122.1 333.1 350.4 473.5 128.9 328.9 95.2 402.1 232.7 914.6 99.7 721.6 461.2 552.8 162.7 760.7 482.2 596.7 100.6 692.3 518.1 837.1 508.5 903.1 580.2
TEN Suppose that the time required to complete a 1040R tax form is normal distributed with a mean of 110 minutes and astandard deviation of 15 minutes. What proportion of 1040R tax forms will be completed in less than 106 minutes? Round your answer to at least four decimal places.
7 Confidence interval for a population proportion Twenty years ago, a very famous psychologist specializing in marriage counseling authored book detailing the way in which she believed spouses should communicate. She is now interested in the proportion of all couples who bought her book who stayed together. For a random sample of 200 couples who bought her book, she found that 162 of them stayed together. Based on this, compute a 95% confidence interval for the proportion of all couples who bought her book who stayed together. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.) Lower limit: Upper limit: Explanation W Check 19 # 3 E $ 4 R S 5 T 6 A Y & 7 11 8 Español 9 CO ? As Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility M
Calculate the mean, variance, and standard deviation of 5 students exam scores, from a Statistics course with a total of 25 students: 99,72,89,62, and 66. Round to two decimal places as needed Click this video to learn more about the formula 99 72 89 62 66 X xx 2 (x − x)² Mean Variance Standard Deviation
Answers 0.826 0.779 0. 221 0. 174
A highschool teacher is interested in examining the math performance of one particular child, Mike, he has observed over several years. The highschool teacher has the mean and standard deviation for each year's maths test along with Mike's score on each test. Year Mean SD Mike's score 2018 90.5 5.1 96 2019 88.7 8.8 95 2020 69.5 3.4 78 Calculate the appropriate statistic to evaluate in which year Mike did his best in the math test relative to the other children tested over the years. To answer this question, we would need to compute a Q1. ABCD for each year, which would be Q2. ABCD for 2018, Q3. ABCD for 2019, and Q4. ABCD for 2020. This would mean that Mike's best math performance was in Q5. ABCD relative to the other children tested over the three years. In that year, he performed better than Q6. ABCD of the other children. Possible answers for Q4:A) -2.50B) -1.67C) 1.67D) 2.50 Possible answers for Q5:A) 2018B) 2019C) 2020D) Cannot tell…
A highschool teacher is interested in examining the math performance of one particular child, Mike, he has observed over several years. The highschool teacher has the mean and standard deviation for each year's maths test along with Mike's score on each test. Year Mean SD Mike's score 2018 90.5 5.1 96 2019 88.7 8.8 95 2020 69.5 3.4 78 Calculate the appropriate statistic to evaluate in which year Mike did his best in the math test relative to the other children tested over the years. To answer this question, we would need to compute a Q1. for each year, which would be Q2. for 2018, Q3. for 2019, and Q4. for 2020. This would mean that Mike's best math performance was in Q5. relative to the other children tested over the three years. In that year, he performed better than Q6. of the other children. Possible answers for Q1:A) performanceB) t-scoreC) raw scoreD) z-score Possible answers for Q2:A) -1.08B) 0.63C) 1.08D) -0.63 Possible answers for…

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