Maze Psychology experiments sometimes involve testing the ability of rats to navigate mazes. The mazes are classified according to difficulty, as measured by the mean length of time it takes rats to find the food at the end. One researcher needs a maze that will take rats an average of about one minute to solve. He tests one maze on several rats, collecting the data shown. a) Plot the data. Do you think the conditions for inference are satisfied? Explain. b) Test the hypothesis that the mean completion time for this maze is 60 seconds. What is your conclusion? c) Eliminate the outlier, and test the hypothesis again. What is your conclusion? d) Do you think this maze meets the one-minute average requirement? Explain.

Inference for Linear Regression: - The idea: o The calculated intercept b0 is a statistic that estimates the population intercept B . The 0 calculated intercept b1 is a statistic that estimates the population intercept B1 . o We can thus perform inference for the two linear parameters (intercept & slope). We are particularly interested in the slope, which indicates whether there is really a linear relationship. o A slope of 0 means no true linear relationship