Mathematics > QUESTIONS & ANSWERS > MATH 225 WEEK 8 FINAL EXAM QUESTIONS & ANSWERS / MATH225 WEEK 8 FINAL EXAM QUESTIONS & ANSWERS | LAT (All)

MATH 225 WEEK 8 FINAL EXAM QUESTIONS & ANSWERS / MATH225 WEEK 8 FINAL EXAM QUESTIONS & ANSWERS | LATEST 2020:Chamberlain College of Nursing (100% SATISFACTIONS)

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Week 8 questions and answers Performing Linear Regressions with Technology An amateur astronomer is researching statistical properties of known stars using a variety of databases. They collect the ... absolute magnitude or MV and stellar mass or M⊙ for 30 stars. The absolute magnitude of a star is the intensity of light that would be observed from the star at a distance of 10 parsecs 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 is V for the visual light spectrum. The scale is logarithmic and an MV that is 1 less than another comes from a star that is 10 times 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 coefficient r between the two data sets, rounding to two decimal places. Correct! You nailed it. r= −0.93 Answer Explanation The correlation coefficient, rounded to two decimal places, is r≈−0.93. A market researcher looked at the quarterly sales revenue for a large e-commerce store and for a large brick-and-mortar retailer over the same period. The researcher recorded the revenue in millions of dollars for 30 quarters. The data are provided below. Use Excel to calculate the correlation coefficient r between the two data sets. Round your answer to two decimal places. Yes that's right. Keep it up! r= −0.81 Answer Explanation The correlation coefficient, rounded to two decimal places, is r≈−0.81 [Show More]

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