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Describe the variables in this research objective 'Do body weight, calorie intake, fat intake, and age have an influence on heart attacks?
a. It has dichotomous independent variable and continuous dependent variables
b. It has continuous independent variables and dichotomous dependent variable
c. It has three dependent variables and one independent variable
d. It has one independent variable and one dependent variable.
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- A company provides maintenance service for water-filtration systems throughout southern Florida. Customers contact the company with requests for maintenance service on their water-filtration systems. To estimate the service time and the service cost, the company's managers want to predict the repair time necessary for each maintenance request. Hence, repair time in hours is the dependent variable. Repair time is believed to be related to three factors, the number of months since the last maintenance service, the type of repair problem (mechanical or electrical), and the repairperson who performed the service. Data for a sample of 10 service calls are reported in the table below. Repair Timein Hours Months SinceLast Service Type of Repair Repairperson 2.9 2 Electrical Dave Newton 3.0 6 Mechanical Dave Newton 4.8 8 Electrical Bob Jones 1.8 3 Mechanical Dave Newton 2.5 2 Electrical Dave Newton 4.9 7 Electrical Bob Jones 4.6 9 Mechanical Bob Jones 4.8 8 Mechanical Bob…Omitting a variable from our model that has a causal effect on our dependent variable always leads to omitted variable bias. a. False b. TrueCarboco puts metal coatings on jet propeller blades. Theharder the coating, the higher the quality of the coating. Thecoating is shot onto the blade using pressurized gascontained in an F-gun. Carboco can control the temperatureand gas pressure in the F-gun and can also control the roomhumidity. To see how gas pressure, temperature, andhumidity influence hardness, Carboco engineers have run aregression for which the dependent variable isHARD hardness of a coatingand the independent variables areHUMIDI room humidityTEMP 1 if temperature level is high0 if temperature level is lowPRESS 1 if gas pressure is high0 if gas pressure is lowT*P product of TEMP and PRESSWe assume that temperature and gas pressure have only twopossible levels, low and high. The relevant data are given inTable 30 (file Temp.xls). a Ignoring considerations of heteroscedasticity, multi-collinearity, and autocorrelation, which equation should be used to predict hardness? Explain.b What combination of gas pressure and…
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