Math 207 Homework Assignment 2

Due Friday, October 1 (beginning of class)

NOTES: As mentioned in the last homework assignment, I expect your homework solutions to be thorough, well-written (use context and complete sentences), neat, complete (thoughtfully answer all parts of the question), well-labeled (clearly label each problem and give all graphs appropriate titles), stapled, and in your own words/explanations (re: Honor Code). These expectations will hold for every homework assignment you turn in.

For this assignment you will use Minitab to create graphs and calculate numerical summaries. The Minitab files needed to do the homework are on the math_207 share folder (in the Homework Data subfolder—U:\Class_Share\Math\math_207\Homework Data). Be sure to copy these files into your personal account (do not simply use the files directly from the share folder).

Six Textbook Problems (please read the additional notes carefully):

Include any graphs or numerical summaries that are asked for within a question. Recall you need not print a graph as an entire sheet of paper. You can save paper by copying a graph into Word, resizing it, and then you can fit multiple graphs on one piece of paper (you can neatly hand-write your answers next to the graphs or simply type your answers in Word).

1.33 (use Minitab; be sure to justify your answer for part a)

1.49 (use Minitab; remember, what the textbook calls a “line chart” is really a time-series graph, and recall you can create your own time-series graph via the scatterplot>with-connect-line option)

1.65 (use Minitab; note: you must “chart data from a table” rather than “chart raw data”; additionally, write a very brief description of the results—in just a few sentences)

2.47 (use Minitab; in part c, you can use the boxplot to partially answer the question, but also create a dotplot to better see the distribution and more fully answer the question)

3.31

4.14

One Additional Problem:

For a sample of 12 residential properties, the square footage and selling price (in thousands) are shown in the scatterplot below. Furthermore, the regression line is drawn in the graph (and the equation of the line and the value of r-squared also shown).

1. In context (in words), interpret the numerical value of the slope of the regression line.

2. In context (in words), interpret the numerical value of .

3. The residual plot from the regression is also shown above. Based on this plot, do you think the regression line is adequate or inadequate as a model of the relationship between these variables? Explain your answer.