The variable rdintens is expenditures on research and development (R&D) as a percentage of sales.Sales are measured in millions of dollars. The variable profmarg is profits as a percentage of sales.Using the data in RDCHEM for 32 firms in the chemical industry, the following equation is estimated:rdintens = .472 + .321 log(sales) + .050 profmarg(1.369) (.216)(.046)n = 32, R² = .099.(a) Interpret the coefficient on log(sales). In particular, if sales increase by 10%, what is the estimatedpercentage point change in rdintens? Is this an economically large effect?(b) Test the hypothesis that R&D intensity does not change with sales against the alternative that it doesincrease with sales. Do the test at the 5% and 10% levels.(c) Interpret the coefficient on profmarg. Is it economically large?(d) Does profmarg have a statistically significant effect on rdintens?

a) The estimated equation is as follows: If the sales are increases by 10%, then expenditure on…

Answered: The variable rdintens is expenditures…

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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Airborne concentrations of a pollutant follow a lognormal distribution. The pollutant has concentrations that exceed 1.5 ppm 33% of the time, and exceed 6.025 ppm 2.5% of the time. What fraction of the time is 13.934 ppm exceeded?
2. An antique computer valued at $6500 depreciates at the rate of 14% per year (b = 0.86). Equation: Circle one: Linear or Exponential 3. The population of flying squirrels in Madagascar started with 3 and the population doubles each year. Equation: Circle one: Linear or Exponential 4. Penny has a stamp collection of 550 stamps. Penny is feeling generous and gives away7 stamps every week. Circle one: Linear or Exponential Equation: 5. The phone company charges a flat rate of $25 per month. In addition they charge $0.05 for each min of service. Write a function to model the relationship between the number of minutes of service each month. 6. Jenny bought a 2016 Ford F-150 for $25,000 which depreciates at a rate of 4.3% per year (b = 0.957). Write a function to model the relationship between time and value of the car. 7. Brian used the equation y = 3x + 7 that represents the new cucumber plant that he bought for his yard, where x represents the weeks since the cucumber plant was planted…
Use the data in the accompanying table to find the logarithmic regression equation to the nearest tenth
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We have measurements from eight companies for the % workforce change in 2010 from 2009 and the % change in profits from 2010 to 2011. % workforce change (x): 1.0 % profit change (y): 1.5 -0.4 -2.6 -3.8 -5.8 -2.5 -0.1 0.4 0.4 0.1 -0.2 -0.5 -7.5 0.2 0.3 We can calculate: Er = -12.7, Ex² = 64.51, Συ--6.8 , Σ 57, Σεy- 46.35. Find the sample correlation between the two variables, and fit a simple linear model to the dataset. Also, plot the residuals, ri, against xi, and comment on the fit of the model.
Simplify. Enter the result as a single logarithm with a coefficient of 1. log, (6a) + log, (9a") %3D Check Answer MacBook Air F4 F5 F6
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