MATH 225N Week 8 Assignment: Correlation Questions-Answers (Summer 2022) Chamberlain.

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Interpret the slope and y-intercept of the least squares regression line Question A scientific study on gerbil population growth results in the data below. x y 8 63 11 77 14 86 17 90 20 140 T... he least squares regression line modeling this data is given by yˆ=13.3+5.567x. What is the intercept of the regression line? Round your answer to one decimal place. Answer 1: Keep trying - mistakes can help us grow. $$3 Answer 2: Not quite - review the answer explanation to help get the next one. $$17 Answer Explanation Correct answers:  $13.3$13.3 The equation y=mx+b defines a line with a slope of m and a y-intercept of b. In this case the intercept or the constant added to x is 13.3. This study source was downloaded by 100000831988016 from CourseHero.com on 04-08-2022 06:24:34 GMT -05:00 https://www.coursehero.com/file/49103242/stat-week-8-questionsdocx/ Question True or False: The more mangoes you eat, the more rashes you get. Well done! You got it right. True False Answer Explanation Correct answer: False Many things can cause an increase or decrease in rashes: diet, exercise, hormones, medication, etc. There are too many other confounding variables that it can not be determined that Mango's are the cause of a rash. Understand the difference between correlation and causation Question Suppose that a large controlled experiment tests whether caffeine improves reaction times. A very large number of randomly selected participants are randomly given identical-seeming pills with varying doses of caffeine (including none) and then given tests of reaction times under the same conditions. The experiment finds a strong negative correlation between caffeine dose and reaction time. (Note that lower reaction times are better.) Identify what can be concluded based on this information. Not quite right - check out the answer explanation. This study source was downloaded by 100000831988016 from CourseHero.com on 04-08-2022 06:24:34 GMT -05:00 https://www.coursehero.com/file/49103242/stat-week-8-questionsdocx/ There is evidence that caffe [Show More]

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