Fit an appropriate equation to the data set (Table 8.15) to predict the examination mark given the
Question:
Fit an appropriate equation to the data set (Table 8.15) to predict the examination mark given the assignment mark for 14 undergraduate students.
(a) Plot a scatter plot and comment on a possible relationship between sales and advertising.
(b) Use Excel regression functions to undertake the following tasks:
(i) Fit linear model
(ii) Check model reliability (r and COD)
(iii) Undertake appropriate inference tests (t and F test)
(iv) Check model assumptions (residual and normality checks)
(v) Provide a 95% confidence interval for the predictor variable.
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