Chapter 7 Homework Math 253 Spring 2008 Dr. Weaver 1. a)
If the numbers are reported with 3 or 4 digits, then the line would be completely straight, with a positive slope. The value of the slope w
Problem 8 Education Level No HS diploma HS diploma, no college Some college, no degree 2-year degree 4-year degree Master's degree Ph.D. or professional Total Count (thousands) 9945 11701 4481 1390 31
Exam #4 Math 253 Spring 2008 Dr. Weaver SHOW AS MUCH OF YOUR WORK AS POSSIBLE. WHERE THE CALCULATOR DOES A LOT FOR, SHOW THE COMMAND THAT YOU ENTERED INTO THE CALCULATOR. I CARE MORE ABOUT HOW YOU D
Exam 1 Math 253
Spring 2008 Dr. Weaver
(15 points) 1. Make a stem and leaf display of the following data set. To conserve space, orient the display horizontally instead of vertically. DATA SET: 1 ,
Math 253 Exam #2 Spring 2008 Dr. Weaver
1. Given the following data set, calculate the correlation coefficient using the z-scores. Show the z-scores in the extra columns of the table, as well as the
Chapter 4 Problems Problem 5 The distribution is be-modal with peaks at 1 and at 7 days. It is skewed to the right with a fairly long tail and some outliers. However, the peak at 1 day is probably due
Chapter 9 Problems 4 a) The years before 1925 are high leverage points and they are all in a pretty straight line, so will have a large effect on R2. It's probably appropriate, although the residuals
CHAPTER 5 PROBLEMS 6, 10, 16, 17, 20, 22, 31, 45 Problem 6 The company is using the mean number of sick days, the union is using the median. The distribution is skewed to the right, with some number o
Problems, Chapter 8 8 a) b) c) 11 a) b) c) the correlation coefficient is r = .845 The price will be .845 standard deviations above the mean price The price of the home should be 1.69 standard deviati
Exam 3 Math 253 Spring 2008 Dr. Weaver
(20 points) 1. A sample group can be divided into three categories: A, B, C. Each member meets one of 4 conditions, numbered 1 through 4. The breakdown is show
Chapter 10 Problems 4 a) The data points seem to fit an upward curce. Out only model, so far, is a straight line (regression line). It won't fit the data points very well, so a re-expression needs to
Math 253 Spring 2008 Dr. Weaver Chapter 2 Homework Assignment 6. WHO 10 crankshafts Cases each crankshaft is one case WHAT the pouring temperature of molten iron WHEN reported in 1995 WHY qual