Math 207 Homework Assignment 1

Due Friday, September 24 (beginning of class)

IMPORTANT NOTES: For this assignment, draw graphs and perform calculations carefully by hand (in future assignments, you will use Minitab to help you). Also, be careful and thorough as you write your solutions (e.g., use complete sentences, write specifically and in context, include units, title graphs appropriately, answer all parts of the question, and show your work—that is, justify your answers). Lastly, please write neatly, be clear when labeling each problem, and staple together the pages of your assignment (there’s a stapler in the Briggs Hall main office). Your homework will be assessed on both content and clarity of exposition. As a statistician, it’s vitally important you understand analysis techniques, apply them appropriately, and interpret/communicate your results in a helpful way. This is where the fun begins!

HONOR CODE: In general, I think it’s fine (and potentially helpful) for students to work together while studying and thinking about the homework problems. But when you write up your detailed homework solutions, your work must be your own (no copying from someone else or copying from the board where someone else has been working—you can make notes about an idea, but you must use your own words and explanations in your actual homework solutions). Obviously, copying from a solutions manual, from a friend, or from solutions to previous offerings of this course are direct and egregious violations of the Honor Code.

I take the Lawrence Honor Code seriously. I think the Honor Code is a special quality of the Lawrence experience; a quality that translates beautifully into a life-long behavior. If you are feeling particularly stressed in this class, come talk with me, but don’t violate the Honor Code—I will pursue any case I feel is an honor code violation.

Textbook Problems (please read the additional notes carefully)

1.53 (only parts a and c, no part b; you need not do any formal calculations when describing the shapes nor when discussing potential outliers; you can ignore the far-left column of each stem-and-leaf plot—we’ll discuss that column briefly in lab, but it provides little useful information)

1.54

1.60

1.61

2.55 (for part d, answer the question, “If we can assume… What do your results say about the difference in individual raisin sizes between the two brands?”)

2.58 (the mean and standard deviation time to recurrence are 8.37 months and 7.67 months, respectively—use these numbers, you don’t have to re-calculate them)

2.64 (only parts b and d—answer to a is provided and ignore c); the mean and standard deviation sleep time are 6.85 hours and 1.01 hours, respectively—use these numbers, you don’t have to re-calculate them)