Question

A scientist conducted an experiment to determine whether an organic cleaner is as effective as a non-organic cleaner in killing germs that cause colds and the flu. To conduct the experiment, the scientist randomly selected 50 doorknobs in a hospital. He cleaned 25 of the door knobs with the organic cleaner, and he cleaned the remaining 25 door knobs with the non-organic cleaner. After cleaning and testing all of the doorknobs, the scientist reported that the organic cleaner killed 90% of germs that cause colds and the flu on the doorknobs, while the non-organic cleaner killed 95% of germs that cause colds and the flu on the doorknobs. What can be concluded from the scientist's report?

Answer 1

The sample taken is random and grouped. 50% doorknobs were cleaned with organic cleaner and 50% were cleaned with non organic cleaner.

It was reported that organic cleaner killed 90% of germs while the non-organic cleaner killed 95% of germs.

Therefore, the following conclusions can be made.

The organic cleaner is 90% effective and the non-organic cleaner is 95% effective.

The non-organic cleaner is more effective in killing germs as compared to organic cleaner in killing germs that cause colds and the flu.

Answer 2

What we can conclude from the scientist's report is that an organic cleaner is not as effective as a non-organic cleaner in killing germs that cause colds and the flu.

This is because a non-organic cleaner killed 95% of the germs while an organic cleaner killed only 90% of the germs.