Question

Hypothesis: Increasing water temperature had no effect on the fermentation rate of yeast.
Experiment: Compared yeast in room-temperature (22°C) water to yeast in lukewarm (45°C) water. Measured CO2 production. Results are shown below.

Which statement is the most appropriate conclusion for David to write?

Increasing temperature had an effect on fermentation rate.

The yeast in lukewarm water had a faster rate of fermentation than the yeast in room temperature water.

The results do not support the hypothesis because the yeast in lukewarm water had a faster fermentation rate than the yeast in room temperature water.
Graph

Answer 1

"The results do not support the hypothesis because the yeast in lukewarm water had a faster fermentation rate than the yeast in room temperature water."

Reason: the hypothesis claimed temperature had no effect, but the measured CO2 production was higher at 45°C, so the data contradict the hypothesis.