Chapter 11.8, Problem 11PPSE

Solution

To explain: The study method used in a given situation and if the sample statistics can estimate the population parameter with no bias.

A controlled experiment is conducted to know about new plant food. Two groups one treatment and a control group were created and the effect of the new food was observed in the treatment group where all other constraints remain constant. As this is a controlled experiment the sample statistics can be used to make a general conclusion about the population parameter without any bias.

Given:

A gardener has two plants in two groups, a treatment group where new food is provided to the plant, and in the control group, no food is given to the plant but all other constraints remain the same like soil, water, and location. The growth of the plants and flowering rates are noted to test the effectiveness of new food.

Explanation:

There were two groups created, one treatment group where a plant is exposed to a new food, and in the control group, the plant has no food but has the same soil, water, and location as in the treatment group. Thus this is a controlled experiment. Keeping all other constraints constant in two groups, the effectiveness of new food on plants can be studied. As this is a controlled experiment the sample statistic can be used to estimate the population parameter and generalize the results with respect to population.