Math153 Name(s): _________________________________________

2/06 _______________________________________________

_______________________________________________

Project 5: (10 points) Analyze class survey: Work Hours and Study Hours

Due: on or before Friday, MARCH 3, 2006.

READ EACH SECTION FIRST BEFORE USING MINTAB14.

1) Open Minitab14.

Enter the class data for Work hours and Study Hours. (Questions How many hours per week will you be working in a typical week during this semester? How many hours per week do you plan to study for this course this semester?)

Open worksheet. These data are on the N drive (Mathcs), called WkStudy. There are 73 people in this dataset.

Opinion: Do you think there is a relationship between these variables? ____ If so, what is it?

2) Find the equation of the regression line. We would like to know if the hours per week spent working influences the hours per week planned studying for the course.

IMPORTANT: Use StudyHrs as the response variable or y variable; use WkHrw as the predictor variable or x variable.

Pull down the menu Stat, Regression, Regression,

For the Response variable, double click on StudyHrs.

For the Predictor variable, double click on WkHrs.

OK

DO NOT ROUND OFF.

Equation of Regression Line: ____________________________________________________________

3) To find the Scatterplot with the line, go to STAT, REGRESSION, Fitted Line Plot. Choose StudyHrs as the response variable and WorkHrs as the predictor variable.

4) Type your name in the Session Window and print the Session Window (the regression analysis), the Scatterplot with line.

-OVER-

5) Which observations are influential or unusual and why? Circle and label observations on your scatterplot which are influential (I) and unusual (U) (i.e. having a large standardized residual and way off the line).

a) Influential: Observation #(s): (Note: there may be none.)__________________

Why influential?

b) Unusual (large standardized residual): Observation #(s) ____________________

Why unusual?

6) Can we generalize this interpretation to the population of day Math153 students taught by the instructor? _____

Use the p-value. Explain briefly.

7) Do you think there is an association between work hours and planned hours of study for the course? ______________ Why or why not?