Read the Following Scenario, and Answer the Questions Below

question 28

Essay

Read the following scenario, and answer the questions below.

THE EXPERIMENT:
Researchers wanted to determine whether pesticide Z is effective at killing grasshoppers that typically invade cornfields. Two 10- acre cornfields located 1 mile apart were chosen. The cornfield to the west was sprayed only with water. The cornfield on the east received the same amount of water with a 10% solution of pesticide Z. The number of grasshoppers in the fields was recorded every week for 10 weeks.

RESULTS:
The number of grasshoppers in the west field treated only with water doubled after 10 weeks.
The number of grasshoppers in the east field treated with pesticide Z declined by 50% after 10 weeks.

-Researchers wanted to determine whether pesticide Z is effective at killing grasshoppers that typically invade cornfields.Two 10- acre cornfields located 1 mile apart were chosen.The cornfield to the west was sprayed only with water.The cornfield on the east received the same amount of water with a 10% solution of pesticide Z.The number of grasshoppers in the fields was recorded every week for 10 weeks.The number of grasshoppers in the west field treated only with water doubled after 10 weeks.The number of grasshoppers in the east field treated with pesticide Z declined by 50% after 10 weeks.Discuss two problems with the design of this experiment,and propose solutions to these problems.

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Definitions:

Systematic Variance

The portion of variation in an outcome that can be consistently explained by variables or factors in a study.

Error Variance

The variability in a set of data that cannot be attributed to the factors being studied, often resulting from measurement errors or other inconsistencies.

Dependent Sample Designs

Research designs involving comparisons of measurements from the same group of subjects under different conditions or at different times.

Extraneous Variables

Factors in a study that could undermine the internal validity by influencing the dependent variable in a way not intended by the research.