An experiment in which nature, not the researcher, manipulates the independent variable is called: Please choose the correct answer from the following choices, and then select the submit answer button. a masked design.

Which type of market produces the highest level of output at the lowest price to consumers?

What does one prolonged blast and one short blast mean?

In a study, people were asked to imagine simple occasions that made them happy and to remember events that made them feel proud about themselves. it was observed that the subjects developed an increasingly positive attitude. these changes are known to be healthy, leading to greater physical activity and reducing unhealthy habits. based on this excerpt, we can conclude that a positive attitude .