Practice and Problem-Solving Exercises

A Practice

See Problem 1.

Make a scatter plot and describe the correlation.

7. { ( 0 , 11 ) , ( 2 , 8 ) , ( 3 , 7 ) , ( 7 , 2 ) , ( 8 , 0 ) } the set open 0 comma 11 close comma open 2 comma 8 close comma open 3 comma 7 close comma open 7 comma 2 close comma open 8 comma 0 close end set
8. Manufacturing The table shows the numbering system used in Europe and the United States for shoe sizes.

See Problem 2.

Write the equation of a trend line.

9. { ( − 10 , 3 ) , ( − 5 , 1 ) , ( − 1 , − 4 ) , ( 3 , − 7 )  ,  ( 12 , − 12 ) } the set open negative 10 comma 3 close comma open negative 5 comma 1 close comma open negative 1 comma negative 4 close comma open 3 comma negative 7 close comma open 12 comma negative 12 close end set
10. { ( − 15 , 8 ) , ( − 8 , 7 ) , ( − 3 , 0 ) , ( 0 , 0 ) , ( 7 , − 3 ) } the set open negative 15 comma 8 close comma open negative 8 comma 7 close comma open negative 3 comma 0 close comma open 0 comma 0 close comma open 7 comma negative 3 close end set

11. The table shows the number of hours you studied before your eight math tests and your percent score on each test.

    Studying Hours and Test Score

    Number of Hours	8	5	12	10	2	9	11	14
    Score (%)	75	62	80	85	35	70	82	95

    See Problem 3.

12. 

    1. Food Production The table below shows pork production in China from 2000 to 2007. Use a calculator to find the line of best fit.
    2. Use your linear model to predict how many metric tons of pork will be produced in 2025.
    3. Use your linear model to predict when production is likely to reach 100,000 metric tons.

    Pork Production in China

    Year	2000	2001	2002	2003	2004	2005	2006	2007
    Production (metric tons)	40,475	42,010	43,413	45,331	47,177	50,254	52,407	54,491

    SOURCE: USDA Foreign Agricultural Service GAIN Report

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