Foofy obtained a significant Fobt from an experiment with five levels. She therefore concludes that changing every condition of the independent variable results in a significant change in the dependent variable. (a) Is she correct? Why or why not? (b) What must she now do?

Foofy obtained a significant Fobt from an experiment with five levels. She therefore concludes that changing every condition of the independent variable results in a significant change in the dependent variable. (a) Is she correct? Why or why not? (b) What must she now do?

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(a) In order to determine if Foofy's conclusion is correct or not, we need to consider some important factors. In experimental design, it is crucial to only change one condition of the independent variable at a time, while keeping all other conditions constant. This is to isolate the effect of that particular independent variable on the dependent variable.

If Foofy changed every condition of the independent variable simultaneously in her experiment, she violated this fundamental principle of experimental design, known as the principle of isolation or control. By changing every condition of the independent variable, she would not be able to attribute the observed significant change in the dependent variable to a specific independent variable. This is because multiple independent variables are being manipulated simultaneously, making it difficult to identify which specific change caused the significant effect on the dependent variable. Therefore, Foofy's conclusion would not be correct.

(b) Foofy should now redesign her experiment to strictly adhere to the principle of isolation or control. She should modify her experimental setup to change only one condition of the independent variable at a time, while keeping all other conditions constant. By doing so, she will be able to determine the specific effects of each independent variable on the dependent variable. This approach will enhance the validity and reliability of her experimental results, allowing her to draw accurate conclusions.