MATH 225N Week 8 Final Exam Questions with Answers and Explanations 2024
MATH 225N Week 8 Final Exam Questions with Answers and Explanations
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
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