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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age, a Bahand will last 6.3 days from the time it is purchased in the store to the time it is too rotten to eat. Is the mean time to spoil different if the banana is hung from the ceiling? The data show results of an experiment with 15 bananas that are hung from the ceiling. Assume that that distribution of the population is normal. 5.5, 3.9, 3.9, 5.7, 6.5, 5.9, 3.9, 7.4, 4.3, 5.9, 4.5, 4.2, 7, 5.1, 4 What can be concluded at the the a = 0.05 level of significance level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Ho: ? Select an answer H₁: ? Select an answer c. The test statistic ? O (please show your answer to 3 decimal places.) (Please show your answer to 4 decimal places.) d. The p-value = e. The p-value is ? a f. Based on this, we should Select an answer the null hypothesis. g. Thus, the final conclusion is that ... The data suggest the populaton mean is significantly different from 6.3 at a = 0.05, so there is…
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
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.
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← 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)
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You've observed the following returns on Mary Ann Data Corporation's stock over the past five years: 38.50 percent, 20.50 percent, 23.50 percent, -25.50 percent, and 12.50 percent. a. What was the arithmetic average return on Mary Ann's stock over this five-year period? (Do not round intermediate calculations. Round the final answer to 2 decimal places.) Arithmetic average return b-1. What was the variance of Mary Ann's returns over this period? (Do not round intermediate calculations. Round the final answer to 6 decimal places.) Variance b-2. What was the standard deviation? (Do not round intermediate calculations. Round the final answer to 2 decimal places.) Standard deviation %
Need crit value, the pictured question b, and rejection region.
Listed below, from left to right and then top to bottom, are numbers of law enforcement fatalities for 20 recent and consecutive years. First find the mean, identify each value as being above the mean (A) or below the mean (B), then test for randomness above and below the mean using α = 0.05. Is there a trend? 183 140 173 172 144 163 242 159 150 165 164 155 191 147 124 160 171 125 106 116 The mean is. (Type an integer or a decimal. Do not round.) C
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

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