It is known that hydrocarbon emissions decreased dramatically during the 1980s. A study was conducted to compare stationary speed hydrocarbon emissions, in parts per million (ppm), for 1980 and 1990 automobiles. Twenty cars of each model were randomly selected and their hydrocarbon emission levels were recorded.The data are as follows:(image)Test the hypothesis that σ1 = σ2 against the alternative that σ1 ≠ σ2. Assume that bothpopulations are normal. Use a P-value.(respond manually)Note:The exercise in the image is the original, it is in Spanish, but it is easy to understand. 2. Se sabe que las emisiones de hidrocarburos disminuyeron de forma dramática durante la décadade 1980. Se realizó un estudio para comparar las emisiones de hidrocarburos a velocidadestacionaria, en partes por millon (ppm), para automóviles de 1980 y 1990. Se seleccionaron alazar 20 automóviles de cada modelo y se registraron sus niveles de emisión de hidrocarburos.Los datos son los siguientes:Modelos 1980:141 359 247 940 882 494 306 210 105 880200 223 188 940 241 190 300 435 241 380Modelos 1990:140 160 20 20 223 60 20 95 360 70220 400 217 58 235 380 200 175 85 65Pruebe la hipótesis de que o1 = 02 contra la alternativa de que o1 # 02. Suponga que ambaspoblaciones son normales. Utilice un valor P.

Introduction: Denote σ1, σ2 as the true population standard deviations of stationary speed…

Answered: It is known that hydrocarbon emissions…

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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Question

It is known that hydrocarbon emissions decreased dramatically during the 1980s. A study was conducted to compare stationary speed hydrocarbon emissions, in parts per million (ppm), for 1980 and 1990 automobiles. Twenty cars of each model were randomly selected and their hydrocarbon emission levels were recorded.
The data are as follows:

(image)

Test the hypothesis that σ1 = σ2 against the alternative that σ1 ≠ σ2. Assume that both
populations are normal. Use a P-value.

(respond manually)

Note:
The exercise in the image is the original, it is in Spanish, but it is easy to understand.