Question

which statement best describes the difference between activity 1 and activity 2?
a activity 1 changes a variable, while activity 2 collects observational data.
b activity 2 has more repeated trials, while activity 1 has fewer trials.
c activity 1 uses more materials, while activity 2 does not use enough materials to provide data.
d activity 2 is more reliable than activity 1.
activity 1
1 roll the same ball down ramps at three different heights.
2 measure the distance the ball travels each time.
3 repeat three times for accuracy.
4 record results in a table.
activity 2
1 watch cars moving on a street.
2 record speeds of cars at different times of day.
3 compare data about car speeds.
4 summarize findings in a notebook.

Explanation:

Activity 1 is an experiment with controlled variables (changing ramp height) and repeated trials (three times for accuracy). Activity 2 is an observational study (watching cars on a street) without controlled variables or multiple trials for the same condition. In scientific methods, experiments (like Activity 1) that change a variable and have repeated trials for data collection are different from observational studies (Activity 2) which just collect observational data.

Answer:

A. Activity 1 changes a variable, while Activity 2 collects observational data.