The graph shows the results of a study to determine whether there is a link between the number of cigarettes smoked by a mother and the birth weight of her baby.
Which conclusions can be drawn from this graph?
1 As the number of cigarettes smoked increases, the weight of the baby always decreases.
2 Factors, other than smoking, affect the birth weight of a baby.
3 Nicotine, tar and carbon monoxide slow the growth of an unborn baby.
4 The majority of all smokers smoke between 10 and 35 cigarettes per day.
1 )
1, 2 and 3
2 )
2, 3 and 4
2 only
4 )
3 only
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