Examkin

Soru

Zorluk: KolayIdentifying Independent, Dependent, and Controlled Variables

An acoustic engineer conducts an investigation to measure how changing the thickness of fiberglass insulation panels affects the sound intensity level (in decibels) transmitted through a drywall frame assembly. During all test runs, the sound source frequency is held constant at 1,000 Hz1,000\text{ Hz}, the room temperature is maintained at 22∘C22^\circ\text{C}, and the dimensions of the drywall test frame remain identical. Match each experimental element from the study to its correct variable classification.

  • Thickness of the fiberglass insulation panelsIndependent Variable
  • Transmitted sound intensity level (in decibels)Dependent Variable
  • Sound source frequency (1,000 Hz1,000\text{ Hz}) and ambient room temperature (22∘C22^\circ\text{C})Controlled Variable

Cevap

Thickness of fiberglass insulation panels matches Independent Variable; Transmitted sound intensity level matches Dependent Variable; Sound source frequency and ambient room temperature match Controlled Variable.
The insulation panel thickness is directly manipulated by the experimenter, so it is the independent variable. The transmitted sound intensity level is the measured outcome, so it is the dependent variable. Environmental factors like temperature (22∘C22^\circ\text{C}) and sound frequency (1,000 Hz1,000\text{ Hz}) are maintained unchanged across trials to ensure a fair test, making them controlled variables.

Adım Adım Çözüm

1
Identify the factor manipulated directly by the experimenter.
The thickness of the fiberglass insulation panels is varied across trials.
The variable intentionally changed to observe its influence is the independent variable.
2
Identify the outcome measured to record experimental results.
The transmitted sound intensity level in decibels is measured.
The observed variable that changes in response to the independent variable is the dependent variable.
3
Identify conditions held constant across all trials.
The sound source frequency (1,000 Hz1,000\text{ Hz}) and room temperature (22∘C22^\circ\text{C}) are held constant.
Parameters kept uniform to isolate the primary relationship being tested are controlled variables.

Anahtar Kavram

Distinguishing independent, dependent, and controlled variables in experimental setups.
Bu soruyu puanla

Konular

Identifying Independent, Dependent, and Controlled Variables

Bu konudan daha fazla soru