04 Aug Does the scatter plot appear linear
Does the scatter plot appear linear? Strong or weak? Positive or negative?
Figure 12.26
18.
Does the scatter plot appear linear? Strong or weak? Positive or negative?
Figure 12.27
19.
Does the scatter plot appear linear? Strong or weak? Positive or negative?
Y
57.
For each of the following situations, state the independent variable and the dependent variable.
- 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.
- A study is done to determine if the weekly grocery bill changes based on the number of family members.
- Insurance companies base life insurance premiums partially on the age of the applicant.
- Utility bills vary according to power consumption.
- 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
POST
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?
https://openstax.org/books/introductory-statistics…
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