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Which of the following is NOT one of the techniques to control extraneous variables?

A web designer is investigating the user-friendliness of three website homepages. Participants interact with the three different layouts. They then report on their user satisfaction.   Which type of independent variable (IV) is being used in this study?

In one study, half of the rats are given one food pellet each time they correctly run a maze, and the other half of the rats are given two food pellets each time they correctly run a maze. The researchers record the average amount of time it takes the rats to run the maze. In this study, the number of food pellets represents the __________ variable.

A nutritionist is conducting a study on the effects of different meal timings on blood sugar levels. Participants are assigned to one of three groups: group 1 eats breakfast, group 2 eats lunch, and group 3 eats dinner as their first meal of the day. Blood sugar levels are measured at regular intervals throughout the day.   Which type of independent variable (IV) is being used in this study?

A researcher calculates how many times a rat presses a food lever in its cage after having been either reinforced or punished for that push. What kind of dependent variable is this?

A ___________ error refers to finding an effect when there really is no effect while a __________ error refers to not finding an effect when there really is an effect

Which of the following is a common method for controlling experimenter effects on the participants? (Select all that apply)

Joseph prescribes half his clinical patients a new migraine medicine and the other half a sugar pill they think is migraine medicine. What kind of independent variable is being used?

Inferential statistics involve _________ the data.

Is there a significant difference between the different groups on the dependent variable? Explain how you came to this conclusion.