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MATLAB: An Introduction with Applications

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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Identify the null and alternative hypotheses for the following problems. (Enter != for + as needed.)
(a) The manager of a restaurant believes that it takes a customer less than or equal to 22 minutes to eat lunch. (Give your hypotheses in minutes.)
Ho:
H
(b) Economists have stated that the marginal propensity to consume is at least 85¢ out of every dollar.
Ho:
(c)
It has been stated that 78 out of every 100 people who go to the movies on Saturday night buy popcorn.

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12. When a certain product is sold at a price of 40 monetary units, 400 items are sold. Each time the price decreases by 0.1 monetary unit, sales increase by 5 units. Denote by x the number of times the price is decreased by 0.1 monetary units. a. Express p and q in terms of x. b. Express x in terms of p. c. Express q in terms of p. Originally, the revenue is 16 000 monetary units. d. Find for which values of p the company has revenue exceeding 16 000 monetary units.
1. In an Economics textbook, the following information is given: TSS=437 and RSS-291. As a student of Econometrics, calculate the ESS and the R-squared. A. ESS-437 and R-squared=0.789 B. ESS=146 and R-squared=0.334 C. ESS=250 and R-squared=0.28 TSS D. ESS=291 and R-squared=8.334 2. What can you say about the above R-squared figure in question one? A. The TSS means that 437 variations in the dependent variables are explained by regressors B. 40% of the regression power is explained by the error term. C. 33.4% variations in the dependent variable are explained by the independent variable(s) D. The independent variables in the model are significant. 146 3. The regression model includes a random error or disturbance term for a variety of reasons. Which of the following is not one of them? A. Measurement errors in the observed variables. B. To capture unobserved omitted relevant influences on y. VSS=RSt° C. A linear functional form may only be an approximation. D. To capture unobserved…
TRUE (1) OR FALSE (2) According to Statistics South Africa (2011), the total human population of KaNgove, a village in Giyani (South Africa), is 6376, while the total number of households is 1545. In this study, the population unit is the households since the study seeks to study indigenous systems of households. Based on the facts above: The population size of this study will be (N=6376)? TRUE / FALSE The population size of this study will be (N=1545)? TRUE/FALSE The sample size will be n=155? TRUE/FALSE
1. In AP Econ, the total points accrued thus far is 800. The instructor has announced that there will be a total of 1000 points at the end of the semester. The final exam, therefore, is worth 200 points. Christina L currently has an average score of 87%. Is it possible for Christina L to squeak by with an A- in the class? Explain. Show your work. Assume an 89.5% in the class is considered an A-.
A media personality argues that global temperatures are not rising, because every year an increase is reported, such as 0.09 degrees C. The difference from the previous year is less than the margin of error of about 0.13 degrees C, so that difference should be ignored. What is a strong counter argument? The difference is only 0.4 but that is still a significant change. The change of 0.9 is not a lot and thus should be ignored. The margin of error is larger than the increase so we should consider it an issue just extra information and thus can be ignored. The margin of error is quite small compared to the change year over year, so it is a significant issue.
If we use a cutoff of 0.05, is it unusual for someone to have a great deal of confidence in educational institutions?
A statistical program is recommended. A highway department is studying the relationship between traffic fow and speed. The foliowing model has been hypothesised: where y- traffic flow in vehicles per hour x- vehicle speed in miles per hour. The following data were collected during rush hour for six highways leading out of the oty. Traffic Flow (v) Vehicle Speed (x) 1,256 35 1.331 40 1.224 30 1,333 45 1,351 50 1.123 25 In working further with this problem, statisticians suggested the use of the folowing eurvinear estimated regression eqation. (a) Develop an estimated regression equaton for the data of the form - , . Round A to the neerest vteger and, to two decimal placen and , to three ocmal pacs) (b) Use a-0.01 to test for a significant relationship State the null and alternatiive hypotheses OHa One or more of the parameters is not equal to tero. H o---0
esc You may need to use the appropriate technology to answer this question. The following is part of the results of a regression analysis involving sales (y in millions of dollars), advertising expenditures (x, in thousands of dollars), and number of salespeople (x₂) for a corporation. The regression was performed on a sample of 10 observations. Constant X1 x2 Ho: 55°F Heavy sleet (a) Write the regression equation. Ha Coefficients -11.320 ŷ = -11.320+0.788x1 +0.151x2 0.788 2 0.151 = Standard Error (b) Interpret the coefficients of the estimated regression equation found in part (a). (Give your answers in dollars.) As advertising increases by 1 unit ($1,000), sales are expected to increase by $ 788 to increase by $ 151 X when advertising is held constant. (c) At a = 0.05, test for the significance of the coefficient of advertising. State the null and alternative hypotheses. (Enter != for # as needed.) B₁ = 0 B₁!=0 Find the value of the test statistic. (Round your answer to two decimal…
1- please I want solution of all sub-parts on an urgent basis. Many thanks
You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is significantly smaller than 60% at a level of significance of a = 0.10. According to your sample, 31 out of 60 potential voters prefer the Democratic candidate.

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