Homework - Speech or Presentation Example

He clocks the speeds of 20 randomly selected cars and 20 randomly selected trucks two miles after a major safety sign. Which statistical test should be used to determine whether drivers of cars and drivers of trucks are differentially affected by safety signs? C. A researcher wants to test whether there is a relationship between political party affiliation and education. She randomly selects 500 people and, for each, notes political party affiliation (Republican, Democrat, Neither) and highest degree earned (high school, college, graduate).

Which statistical test should be used to determine whether there is a relationship between political party affiliation and education? D. In a study of group productivity, subjects worked in groups of various sizes to develop new computer software. Subjects were randomly assigned to work in groups of two, ten, or fifteen. Which statistical test should be used to determine whether group size has an effect on productivity? A psychologist at a private mental hospital was asked to determine whether there was any clear difference in the length of stay of patients with different categories of diagnosis.

Looking at 4 patients in each of the three major categories, the results (in terms of weeks of stay) were as follows: Therefore, the mean between drug related conditions and cognitive behavior are similar. However, the mean between behavior and drug related and, the mean between behavior and cognitive are also different. In a study on the effect of the invasion of personal space, experimenters approached pedestrians walking alone and asked them for directions. When the pedestrian started giving directions, the experimenter took a step toward him/her.

An observer then noted whether the pedestrian responded to this invasion of personal space by staying where he/she was, by taking a step forward, or by taking a step back. The table below shows