Chapter 12: Q. 17 (page 715)
Does the scatter plot appear linear? Strong or weak? Positive or negative?
Short Answer
The plot is linear with strong and the correlation is positive
Chapter 12: Q. 17 (page 715)
Does the scatter plot appear linear? Strong or weak? Positive or negative?
The plot is linear with strong and the correlation is positive
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The data points for the graph from the third exam/final exam example are as follows: (1, 5), (2, 7), (2, 6), (3, 9), (4, 12), (4, 13), (5, 18), (6, 19), (7, 12), and (7, 21). Remove the outlier and recalculate the line of best fit. Find the value of ลท when x = 10.
The average number of people in a family that attended college for various years is given in Table 12.29.
a. Using โyearโ as the independent variable and โNumber of Family Members Attending Collegeโ as the dependent variable, draw a scatter plot of the data.
b. Calculate the least-squares line. Put the equation in the form of: \(\hat{y}=a+bx\)
c. Find the correlation coefficient. Is it significant?
The following table shows data on average per capita coffee consumption and heart disease rate in a random sample of \(10\) countries.
a. Enter the data into your calculator and make a scatter plot.
b. Use your calculatorโs regression function to find the equation of the least-squares regression line. Add this to your scatter plot from part a.
c. Explain in words what the slope and y-intercept of the regression line tell us.
Table 12.22 gives the gold medal times for every other Summer Olympics for the womenโs \(100-\)meter freestyle (swimming).
a. Decide which variable should be the independent variable and which should be the dependent variable.
b. Draw a scatter plot of the data.
c. Does it appear from inspection that there is a relationship between the variables? Why or why not?
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