An instructor at Arizona State University asked a random sample of eight students to record their study times in a beginning calculus course. She then made a table for the total number of hours studied(x) over a period of 2 weeks and test score(y) at the end of the two weeks. Here are the results. x 10 15 12 20 8 16 14 22y 92 81 84 74 85 80 84 80(i) Find the regression equation for the data points.(ii) Graph the regression equation and the data points. (iii) Describe the apparent relationship between the two variables under consideration.(iv) Interpret the slope of the regression line. (v) Identify the predictor and the response variables. (vi) Predict the score of a student who studies for 15 hours.

What is the y-intercept of the line given by the equation

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average