Give a solution to this: A lecturer wondered whether the length of time his students revised for an examination had an effect on the marks they scored in the examination. Before the examination he asked a random sample of them to honestly estimate how long to the nearest hour they had spent revising. After the examination he investigated the relationship between the two variables and obtained the following results.
Student A B C D E F G H I J
Revision time 4 9 10 14 5 7 12 22 1 17 Exam mark 31 58 65 73 37 44 60 91 21 84
i) Plot a scatter diagram and draw a line of best fit.
ii) Find Pearson product correlation co-efficient.
iii) Calculate Spearman correlation co-efficient.
iv) Calculate the equation of the regression line
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