24. A manufacturing plant output model is Q = ß₁+ ß2MGTEFF + ß3CAP + ß4LAB + e,where Q is the output in a particular manufacturing plant, MGTEFF is a managerialefficiency index, CAP is capital stock input index and LAB is labor input index.Measuring MGTEFF is difficult. Suppose Q B₁+ B₂EXPER+ ß3CAP + ß4LAB + ewhere EXPER is the plant manager's experience, measured in years is proposed. Whymight we worry that EXPER is endogenous?A. Manager's experience may have measurement errorsB. Manager's experience maybe correlated with omitted variables.C. Plant output and manager's experience maybe jointly determined.D. All the above.25. Ordinary least squares method assumes time series data are stationary. Which of thefollowing depicts a stationary time series?1816-14-12-10-8-6-wymgmgmgmypergunjungmp-rpiqunjungtung84 86 88 90 92 94 96 98 00 02 04 06 08 10 12 14 16(a) Real gross domestic product (GDP), Strillion (quarterly)1612-8-4-0--455 60 65در استان ها باINF70 75 80 85 90 95(c) Inflation, percent (monthly)A. Real GDPB. Change in real GDPC. InflationD. Change in inflation00 05 10 15стриальную-0.4mmvepupupuya84 86 88 90 92 94 96 98 00 02 04 06 08 10 12 14 16(b) Change in GDP (quarterly)0.30.2-0.1-0.0--0.1--0.2--0.3-55 60 6570 75 80 85 90 95 00(d) Change in inflation (monthly)וווווווווד05 10 15

24. A manufacturing plant output model is given by: Q=β1+β2MGTEFF+β3CAP+β4LAB+e Where: Q=…

Answered: A manufacturing plant output model is Q…

Linear Algebra: A Modern Introduction

4th Edition

ISBN:9781285463247

Author:David Poole

Publisher:David Poole

Chapter2: Systems Of Linear Equations

Section2.4: Applications

Problem 28EQ

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2. Suppose that in Example 2.27, 400 units of food A, 500 units of B, and 600 units of C are placed in the test tube each day and the data on daily food consumption by the bacteria (in units per day) are as shown in Table 2.7. How many bacteria of each strain can coexist in the test tube and consume all of the food? Table 2.7 Bacteria Strain I Bacteria Strain II Bacteria Strain III Food A 1 2 0 Food B 2 1 3 Food C 1 1 1
Cholesterol Cholesterol in human blood is necessary, but too much can lead to health problems. There are three main types of cholesterol: HDL (high-density lipoproteins), LDL (low-density lipoproteins), and VLDL (very low-density lipoproteins). HDL is considered “good” cholesterol; LDL and VLDL are considered “bad” cholesterol. A standard fasting cholesterol blood test measures total cholesterol, HDL cholesterol, and triglycerides. These numbers are used to estimate LDL and VLDL, which are difficult to measure directly. Your doctor recommends that your combined LDL/VLDL cholesterol level be less than 130 milligrams per deciliter, your HDL cholesterol level be at least 60 milligrams per deciliter, and your total cholesterol level be no more than 200 milligrams per deciliter. (a) Write a system of linear inequalities for the recommended cholesterol levels. Let x represent the HDL cholesterol level, and let y represent the combined LDL VLDL cholesterol level. (b) Graph the system of inequalities from part (a). Label any vertices of the solution region. (c) Is the following set of cholesterol levels within the recommendations? Explain. LDL/VLDL: 120 milligrams per deciliter HDL: 90 milligrams per deciliter Total: 210 milligrams per deciliter (d) Give an example of cholesterol levels in which the LDL/VLDL cholesterol level is too high but the HDL cholesterol level is acceptable. (e) Another recommendation is that the ratio of total cholesterol to HDL cholesterol be less than 4 (that is, less than 4 to 1). Identify a point in the solution region from part (b) that meets this recommendation, and explain why it meets the recommendation.
A company that sells digital devices has its stores in several cities in Albania. The Marketing Manager plans to transmite an advertisement for the digital camera product on local television and watch sales of that product, to see the link that exists with the number of ads transmitted and product sales. After two days, the results were presented in the following table: City Trasmitted Sales(in 000 Euro) Durrës 4 15 Sarandë 2 8 Fier 5 21 Berat 6 24 Lezhë 3 17 S S = 1.58 S = 6.1 a) What is the dependent variable?b) Construct the scatterdiagram of this connection.c) Calculate the coefficient of variation and the coefficient of determination.d) Interpret the relationship between two variables.e) What is the equation that connects these two variables? Explain the values for a and b.f) What is the expected level of sales if 10 ads are trasmitted
Economists, Angrist and Lavy (1999) exploited an 800 year-old rule regarding classroom size to estimate the causal effect of smaller classes on student achievement. The rule, made famous by 12th century scholar Maimonides, states that one teacher is sufficient to manage a class with up to 40 students. Classes with more than 40 students will require 2 teachers. Angrist and Lavy noticed that strict application of this rule in certain areas meant that if 80 students were enrolled in a school, then the school would divide them up into two groups of 40 students per teacher. If 81 students were enrolled, however, they would be placed in three classes of 27 students each. The rule thus generated sharp discontinuities in class sizes within schools, which, the authors argue, allow them to provide causal evidence of a boost in fifth grade math and reading scores as a result of smaller class size. a. What research design is implied by the authors’ use of Maimonides’ rule to estimate the causal…

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