By Berchie Holliday
Publication via Holliday, Berchie, Cuevas, Gilbert J., McClure, Melissa S.
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Extra resources for Advanced Mathematical Concepts: Precalculus with Applications
Economics The table shows the closing value of a stock index for one week in February, 1999. Stock Index February, 1999 a. Using the day as the x-value and the closing value as the y-value, write equations in slope-intercept form for the lines that represent each value change. b. 77 pair of days was the same? Was the rate of change the same for any of the days shown? 55 c. 13 the next business day. 87. Did any equation correctly predict this value? Explain. Mixed Review Day 35. Write the slope-intercept form of the equation of the line through the point at (1, 5) that has a slope of Ϫ2.
Source: World Almanac 12. Critical Thinking Different correlation coefficients are acceptable for different situations. For each situation, give a specific example and explain your reasoning. a. 99 be considered unsatisfactory? b. 6 be considered good? c. When would a strong negative correlation coefficient be desirable? Lesson 1-6 Modeling Real-World Data with Linear Functions 43 13. Critical Thinking The table shows the median salaries of American men and women for several years. According to the data, will the women’s median salary ever be equal to the men’s?
1. Explain what the slope in a best-fit line represents. 2. Describe three different methods for finding a best-fit line for a set of data. 3. Write about a set of real-world data that you think would show a negative correlation. Guided Practice Complete parts a–d for each set of data given in Exercises 4 and 5. a. Graph the data on a scatter plot. b. Use two ordered pairs to write the equation of a best-fit line. c. Use a graphing calculator to find an equation of the regression line for the data.