Answer:
No; the study is based on a volunteer sample, which may be very different from a randomly selected one.
Explanation
Her plan cannot be effective because she could base her own judgenent on samples that was randomly selected for consideration.
Early detection of an asthma exacerbation is critical in a child. Peak flow is a fast and easy measurement helpful in determining the severity of the exacerbation. Documenting measurements that reads lower during exposure of certain allergens is a way to determine what the main cause of the exacerbations in the child.
Maritime, Construction, General Industry, Agriculture
This is the ones that are covered under neath it
Random. Hope this helps:)
