MATH 225N MATHWeek 8 Questions and Answers.

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Week 8 questions and answersPerforming Linear Regressions with TechnologyAn amateur astronomer is researching statistical properties of known stars using a variety of databases. They collect the absol... ute magnitude orMVand stellarmass orM⊙for30stars. The absolute magnitude of a star is the intensity of light that would be observedfrom the star at a distance of10parsecs from the star. This is measured in terms of a particular band of the light spectrum, indicated by the subscript letter, which in this case isVfor the visual light spectrum. The scale is logarithmic and anMVthat is1less than another comes from a star that is10times more luminous than the other. The stellar mass of a star is how many times the sun's mass it has. The data is provided below. Use Excel to calculate the correlation coefficientrbetween the two data sets, rounding to two decimal places.Correct! You nailed it.r= −0.93Answer ExplanationThe correlation coefficient, rounded to two decimal places, isr≈−0.93.A market researcher looked at the quarterly sales revenue for a large e-commerce storeand for a large brick-and-mortar retailer over the same period. The researcherrecorded the revenue in millions of dollarsfor30quarters. The data are provided below. Use Excel to calculate the correlation coefficientrbetween the two data sets. Round your answer to two decimal places [Show More]

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