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Chapter 12: Q. 18 (page 715)
Does the scatter plot appear linear? Strong or weak? Positive or negative?
The scatter plot shows that its not linear with positive correlation. It indicates that the plot is strong
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56. The Standard Deviation for the Sum of Squared Errors for a data set is. What is the cutoff for the vertical distance that a point can be from the line of best fit to be considered an outlier?
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: \(\hat{y}=a+bx\)
Use the following information to answer the next two exercises. The price of a single issue of stock can fluctuate throughout the day. A linear equation that represents the price of stock for Shipment Express is where is the number of hours passed in an eight-hour day of trading.
If you owned this stock, would you want a positive or negative slope? Why?
62. If the level of significance is and the -value is , what conclusion can you draw?
SCUBA divers have maximum dive times they cannot exceed when going to different depths. The data in Table 12.4 show different depths with the maximum dive times in minutes. Use your calculator to find the least-squares regression line and predict the maximum dive time for feet.
| X (depth in feet) | Y (maximum dive time) |
| 50 | 80 |
| 60 | 55 |
| 70 | 45 |
| 80 | 35 |
| 90 | 25 |
| 100 | 22 |
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