Question

which are ways to improve the design of this experiment? check all that apply.
reduce the sample size so the experiment can be done faster.
increase the sample size from 6 cups to 12 cups of sand and water.
use more legible handwriting when recording data.
use more precise digital thermometers.
use more precise scales that measure to the hundredth of a gram.

Explanation:

• Increasing the sample size (from 6 to 12 cups) reduces sampling error and makes results more reliable.
• Using more precise digital thermometers and scales (measuring to the hundredth of a gram) reduces measurement error.
• Reducing sample size would make results less reliable. Legible handwriting is good but doesn't improve the experimental design's validity (it's about data - recording neatness, not the experiment's core design).

Answer:

Increase the sample size from 6 cups to 12 cups of sand and water; Use more precise digital thermometers; Use more precise scales that measure to the hundredth of a gram.