Concept explainers
Critical Thinking: Interpreting Computer Printouts Refer to the description of a computer display for regression described in Problem 5. The following Minitab display gives information regarding the relationship between the body weight of a child (in kilograms) and the metabolic rate of the child (in 100 kcal/24 hr). The data are based on information from The Merck Manual (a commonly used reference in medical schools and nursing programs).
Predictor | Coef | SE Coef | T | P |
Constant | 0.8565 | 0.4148 | 2.06 | 0.084 |
Weight | 0.40248 | 0.02978 | 13.52 | 0.000 |
s = 0.517508 R-Sq = 96.8%
(a) Write out the least-squares equation.
(b) For each 1-kilogram increase in weight, how much does the metabolic rate of a child increase?
(c) What is the value of the sample
(d) Interpretation What percentage of the variation in y can be explained by the corresponding variation in x and the least-squares line? What percentage is unexplained?
For Problems 7-18, please do the following.
(a) Draw a
(b) Verify the given sums
(c) Find
(d) Graph the least-squares line on your scatter diagram. Be sure to use the point
(e) Interpretation Find the value of the coefficient of determination
Answers may vary slightly due to rounding.
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Chapter 4 Solutions
Understanding Basic Statistics
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