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 would depend on the scales used on the two axes. It
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 3133 1213 757 32620 Percent 30.5 35.9 13.7 4.3 9.6 3
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 DID THE PROBLEM THAN ABOUT THE ANSWER YOU GOT. 1. I
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 , 10, 13, 25, 14, 37, 9, 26, 18, 2, 34, 42, 16, 21,
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 results of any other intermediate calculations th
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 to incorrect diagnoses. Some of those events woul
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 are starting to increase in a regular pattern towa
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 of employees having severe illness or injuries. Pro
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 deviations below the mean price y has units of seconds, x
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 shown in the table below. Find the probabilities that:
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 be done to straighten the line. Additionally, the
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 quality control HOW random sampling VARIABLE Pouring