A2 11. Which type of data is displayed in the table below?obsneyearhpricepregtassgrfbthrbdrs19932019936701401320232002434.3.025116125025219952022004.25315402032019955720016a) Cross sectionb) Pooled cross sectionc) Panel datad) Time series data12. What is not an advantage of using pooled cross section as opposed to a single crosssection?a) Standard errors will be smaller.b) It allows us to estimate how the effect of one factor has changed over time.c) It allows us to do first diference and fixed effects estimation.d) It allows us to estimate time trends conditional on explanatory variables.13. What is the IV estimator, By, in a model with the dependent variable y, theendogenous independent variable x and the instrumental variable z? Note that noother independent variables are included in this IV estimation.a) By = Brs, where Br, is the estimated first stage coefficient and Bar is theBRFestimated reduced form coefficient.Cov(xy)b) BvVar(x)c) BvCov(zy)%3DVar (z)d) ByCov(z.y)Cov(z,x)%3D 14. Imagine we want to estimate the effect of education on log(wage) with aninstrumental variable estimation. Which of the following variables is most likely tofulfill the IV exogeneity assumption?a) Score on an IQ test.b) Day of the week on which the individual was born.c) Female.d) Work experience.15. Consider the following figureOutcomeT,ВT;-C2Pre-treatmentPost-treatment Timewhere T, and C, are the outcomes of the treatment and control group before thetreatment (in period 1) and T, and C, are the outcomes of the treatment and controlgroup after the treatment (in period 2). B is the outcome of the treatment group inperiod 2 if the treatment group would not have been treated.What is the causal effect of the treatment and the difference in difference (Diff-in-Diff) estimator of the treatment?a) Causal effect: T,- B. Diff-in-Diff estimator: T- Ab) Causal effect: T,- A. Diff-in-Diff estimator: T,- C,c) Causal effect: T,- T,. Diff-in-Diff estimator: T,- Ad) Causal effect: T,- B. Diff-in-Diff estimator: T,- B

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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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At a toll-booth on-ramp there is a stochastic arrival distribution. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals. Based on data collected, no vehicles arrived in 18 of the 120 count intervals. What is the number of the 120 intervals that 3 cars arrived?
Suppose that during lean hours in a call center, the number of calls received during any specified time period follows a Poisson distribution and, on average, the call center receives 20 calls in a hour. 1.What is the probability that there will be 25 calls in a 1 hr interval during lean hours? 2.What is the probability that there will be at least 1 call received in a 15 min interval during lean hours?
Suppose the number X of tornadoes observed in a particular region during a 1-year period has a Poisson distribution with λ = 5.
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Two Poisson processes with rates λ1=6.507and λ2=0.368 resulted from splitting a Poisson process. What is the probability that an arrival from the "parent" process will belong to the second process with rate λ2? Specify your answer to four decimal places.
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A turnpike toll area contains four toll booths arranged in parallel. The arriVing vehicles conformto the Poisson distribution, with an average headway of 12 s. Assuming that the average service, time is 5 s, the service time is negative- exPonential, and the_ queue discipline is FIFO, find theaverage queue length and the expected time in the system if (1) two of the booths are in operationand (2) Only one booth is open
11-9. Identify three situations in whichever organizations would be interested in limiting the standard deviation of this process.
8.7 It is conjectured that when fields are overgrazed by cattle there will be a substantial reduc- tion in the available grass during the subsequent grazing season due to the compaction of the soil. A horticulturist at the state agricultural experiment station designs a study to evaluate the conjec- ture. Twenty-one plots of land of nearly the same soil texture and suitable for grazing are selected for the study. Three grazing regimens selected for evaluation are randomly assigned to 7 plots each. After the 21 plots are subjected to the grazing regimens for four months, the researcher randomly selects 10 soil cores from each plot and measures the bulk density (g/cm3) in each soil core. The mean soil density of the 10 cores from each plot is given in the following table. Grazing Regimen Soil Denisty (g/cm3) Continuous grazing 2.05 3.05 3.12 1.59 3.83 1.53 1.44 Three-week grazing, one-week no grazing 1.20 1.48 3.54 1.03 1.45 1.40 2.68…
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In a Denver community, 50 cases of diabetes were reported among 15-19 years old out of a total population of 46,000 between September 1 to December 31, 2016. Ten percent (4,600) of the population were between 15-19 years old on April 1, 2016 and the size and age distribution of the population has remained constant. An investigation of the cases in the 15-19-year age group revealed that 22 of the reported cases were contracted prior to September 1. In addition, another 18 cases developed in April and May but were clinically resolved before September 1. What was the cumulative incidence rate of disease in 15-19 year olds per 1,000 population in this Denver community during the period September 1 to December 31, 2016?

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