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Chapter 12: Q.31 (page 717)
What would you predict the sales to be on day 60?
The predicted sales on day will be
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Table 12.20 shows the life expectancy for an individual born in the United States in certain years.
a. Decide which variable should be the independent variable and which should be the dependent variable.
b. Draw a scatter plot of the ordered pairs.
c. Calculate the least squares line. Put the equation in the form of: \(\hat{y}=a+bx\)
Does the line seem to fit the data? Why or why not?
62. If the level of significance is and the -value is , what conclusion can you draw?
A researcher is investigating whether population impacts homicide rate. He uses demographic data from Detroit, MI to compare homicide rates and the number of the population that are white males.
a. Use your calculator to construct a scatter plot of the data. What should the independent variable be? Why?
b. Use your calculator鈥檚 regression function to find the equation of the least-squares regression line. Add this to your
scatter plot.
c. Discuss what the following mean in context.
i. The slope of the regression equation
ii. The y-intercept of the regression equation
iii. The correlation \(r\)
iv. The coefficient of determination \(r2\).
Table contains real data for the first two decades of flu cases reporting
Find the correlation coefficient
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