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08 Aug Does the scatter plot appear linear

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Does the scatter plot appear linear? Strong or weak? Positive or negative? 

This is a scatterplot with several points plotted in the first quadrant. The points form a clear pattern, moving upward to the right. The points do not line up , but the overall pattern can be modeled with a line. 

Figure 12.26 

18.  

Does the scatter plot appear linear? Strong or weak? Positive or negative? 

This is a scatterplot with several points plotted in the first quadrant. The points move downward to the right. The overall pattern can be modeled with a line, but the points are widely scattered. 

Figure 12.27 

19.  

Does the scatter plot appear linear? Strong or weak? Positive or negative? 

This is a scatter plot with several points plotted all over the first quadrant. There is no pattern. 

Y 

57.  

For each of the following situations, state the independent variable and the dependent variable. 

  1. A study is done to determine if elderly drivers are involved in more motor vehicle fatalities than other drivers. The number of fatalities per 100,000 drivers is compared to the age of drivers. 
  2. A study is done to determine if the weekly grocery bill changes based on the number of family members. 
  3. Insurance companies base life insurance premiums partially on the age of the applicant. 
  4. Utility bills vary according to power consumption. 
  5. A study is done to determine if a higher education reduces the crime rate in a population. 

70.  

Table 12.22 gives the gold medal times for every other Summer Olympics for the women’s 100-meter freestyle (swimming). 

Year 

Time (seconds) 

1912 

82.2 

1924 

72.4 

1932 

66.8 

1952 

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70. Table 12.22 gives the gold medal times for every other Summer Olympics for the women’s 100-meter freestyle (swimming).YearTime (seconds)191282.2192472.4193266.8195266.8196061.2196860.0197655.65198455.92199254.64200053.8200853.1Table 12.22Decide which variable should be the independent variable and which should be the dependent variable.Draw a scatter plot of the data.Does it appear from inspection that there is a relationship between the variables? Why or why not?Calculate the least squares line. Put the equation in the form of: ? = a + bx.Find the correlation coefficient. Is the decrease in times significant?Find the estimated gold medal time for 1932. Find the estimated time for 1984.Why are the answers from part f different from the chart values?Does it appear that a line is the best way to fit the data? Why or why not?Use the least-squares line to estimate the gold medal time for the next Summer Olympics. Do you think that your answer is reasonable? Why or why not?

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