Draw regression line on same graph with the scatter diagram

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Reference no: EM13953370

In a study of saliva cotinine, seven subjects, all of whom had abstained from smoking for a week, were asked to smoke a single cigarette. The cotinine levels at 12 and 24 hours after smoking are provided in Table E8.2.

(a) Draw a scatter diagram to show a possible association between the cotinine levels (24-hour measurement as the dependent variable) and check to see if a linear model is justified.

Cotinine Level (mmol/L)

Subject	After 12 hours	After 24 hours
1	73	24
2	58	27
3	67	49
4	93	59
5	33	0
6	18	11
7	147	43

(b) Estimate the regression parameters, the 24-hour measurement for a subject with a 12-hour cotinine level of 60 mmol/L, and draw the regression line on the same graph with the scatter diagram.

(d) Calculate the coefficient of determination and provide your interpretation.

Reference no: EM13953370

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