The solar spectrum (see the image below) is an example of a(n) __________ spectrum. 
Definitions:
Interrupted Time Series Design
A quasi-experimental research design that examines the effects of an intervention by analyzing data collected at multiple points before and after the intervention is implemented.
Traumatic Head Injuries
Physical injuries to the head that may result in impairment or damage to the brain.
Mandatory Helmet
A rule or law requiring individuals to wear helmets while engaging in certain activities, such as cycling or motorbiking, to reduce the risk of head injuries.
Quasi-experimental Design
A research design that lacks the full control of true experimental designs but still includes an intervention or treatment.
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