Question

1. anna wanted to see what battery lasted the longest. she put each battery into a clock and recorded the time that the clock stopped. she used duracell, energizer, xuper brand, and everready.

a. independent variable (iv)
b. dependent variable (dv)
c. control
d. constants

Explanation:

a. Independent Variable (IV)

The independent variable is the factor that is manipulated in an experiment. Here, Anna is testing different battery brands (Duracell, Energizer, Xuper brand, EverReady), so the battery brand is the IV as it's what she changes to observe its effect.

The dependent variable is what is measured in response to the independent variable. Anna measures the time the clock stops, so this time depends on the battery brand, making it the DV.

A control in an experiment is a standard for comparison. If there was a standard battery (or a consistent setup like the same clock model) to compare against the tested brands, that would be the control. Assuming a standard, it could be a commonly used battery brand or the same clock setup.

Answer:

Battery brand (Duracell, Energizer, Xuper brand, EverReady)

b. Dependent Variable (DV)