Question

A student project measured the increase in the heart rates of fellow students when they stepped up and down for three minutes to the beat of a metronome. The step was either 5.75 inches or 11.5 inches high and the metronome beat was either 14, 21, or 28 steps per minute. Five students stepped at each combination of height and speed.

What are the subjects?
O The combinations of height and speed.
O Increased heart rates.
The step height and metronome beat.
O The students.
What are the factors?
O Combinations of step height and rate.
O Stepping up and down for 3 minutes.
O Step height and rate.
O The increase in heart rate.
What are the treatments?
O Combinations of step height and rate.
O Stepping up and down for three minutes.
O'Step height and rate.
O The two levels of step height and the 3 levels of rate.

Answer 1

In a high school Biology experiment, the subjects are the students, the factors are the step heights and metronome rates, and the treatments are the combinations of these factors. Heart rate measurements are relevant to the experiment outcomes, with calculations made from beats and time intervals.

Step-by-step explanation:

The student project in question is an experiment in Biology, related to exercise physiology. The subjects in the experiment are the five students who performed the stepping exercise at each combination of step height and rate. The factors of the experiment are the two levels of step height (5.75 inches and 11.5 inches) and the three levels of metronome rate (14, 21, or 28 steps per minute). The treatments applied in this study are the combinations of each step height with each stepping rate, with five students stepping at each combination.

When measuring heart rate, for instance, the heart rate and its uncertainty can be calculated by the number of beats counted over a specific time interval. In one example, a heart rate is calculated with an uncertainty by counting 40 + 1 beats in 30.0 ± 0.5 seconds, which would then be converted to beats per minute to find the rate and its uncertainty. Similarly, if an athlete's heart rate is a steady 150 beats per minute during exercise, the time per beat in seconds would be the reciprocal of the beats per minute.