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Correlation and Regression Analysis Question 2                  The marks in a Physics exam (P) and a Chemistry exam (C)...

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Question

Statistics

Correlation and Regression Analysis

Question2                 

The marks in a Physics exam (P) and a Chemistry exam (C) wererecorded for 15 students:

Physics

25

46

63

45

78

18

84

48

73

50

61

89

38

36

30

Chemistry

31

44

58

49

66

12

61

56

70

57

62

56

29

40

38

  1. Draw a scatter diagram and comment.
  2. Find the regression line where the Chemistry mark is theexplanatory variable and the Physics mark is the responsevariable.
  3. Calculate the correlation between P and C. Test the hypothesis,at 5%, that it is positive.
  4. Predict the Physics mark of three students, one obtaining 20 inChemistry, one 50 in Chemistry and the third 80 in Chemistry. Whichof the three predictions do you trust more?
  5. Perform a hypothesis test that the slope of the regression lineis positive.

Answer & Explanation Solved by verified expert
4.1 Ratings (480 Votes)
abPhysics 35621 11487 Chemistryccorrelation between P and C r 08465 Positive and Strongcorrelation between P and CHypothesisH0 0Ha 0Testt    See Answer
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