Contents
- Preface
1Sampling and Data
- Introduction
- 1.1Definitions of Statistics, Probability, and Key Terms
- 1.2Data, Sampling, and Variation in Data and Sampling
- 1.3Frequency, Frequency Tables, and Levels of Measurement
- 1.4Experimental Design and Ethics
- 1.5Data Collection Experiment
- 1.6Sampling Experiment
- Key Terms
- Chapter Review
- Practice
- Homework
- Bringing It Together: Homework
- References
- Solutions
10Hypothesis Testing with Two Samples
- AAppendix A Review Exercises (Ch 3–13)
- BAppendix B Practice Tests (1–4) and Final Exams
- CData Sets
- DGroup and Partner Projects
- ESolution Sheets
- FMathematical Phrases, Symbols, and Formulas
- GNotes for the TI-83, 83+, 84, 84+ Calculators
- HTables
- Index
12.7
Regression (Textbook Cost) (Optional)
Stats Lab
Regression (Textbook Cost)
Student Learning Outcomes
- The student will calculate and construct the line of best fit between two variables.
- The student will evaluate the relationship between two variables to determine whether that relationship is significant.
Collect the Data Survey 10 textbooks. Collect bivariate data (number of pages in a textbook, the cost of the textbook).
- Complete the table.
Number of Pages Cost of Textbook Table 12.11 - Which variable should be the dependent variable and which should be the independent variable? Why?
- Graph pages vs. cost. Plot the points on the graph in Analyze the Data. Label both axes with words. Scale both axes.
Analyze the Data Enter your data into a calculator or computer. Write the linear equation, rounding to four decimal places.
- Calculate the following:
- a = ______
- b = ______
- correlation = ______
- n = ______
- equation: y = ______
- Is the correlation significant? Why or why not? (Answer in complete sentences.)
- Supply an answer for the following scenarios:
- For a textbook with 400 pages, predict the cost.
- For a textbook with 600 pages, predict the cost.
- Obtain the graph on a calculator or computer. Sketch the regression line.
Figure 12.21
Discussion Questions
- Answer each question in complete sentences.
- Does the line seem to fit the data? Why?
- What does the correlation imply about the relationship between the number of pages and the cost?
- Are there any outliers? If so, which point is an outlier?
- Should the outlier, if it exists, be removed? Why or why not?