A planet€™s orbital velocity is the speed that a planet travels around the Sun. The orbital velocities and the mean distances from the Sun of the 8 planets in our solar system are shown in Table 25.

Let v be the orbital velocity (in km/s) of a planet, and let d be the planet€™s mean distance (in million km) from the Sun.
a. Construct a scatterplot. Treat a planet€™s mean distance from the Sun as the explanatory variable and the planet€™s orbital velocity as the response variable.
b. Describe the four characteristics of the association.
c. The value of r is -0.77, which confuses a student, who thinks r should be - 1, because the association is so strong. What would you tell the student?
d. Find Earth€™s orbital velocity in miles per hour. Round to the ones place.
e. The association is actually true for all bodies that travel around the Sun. Pluto is 5870 million km from the Sun. Is Pluto€™s orbital velocity greater than or less than Neptune€™s orbital velocity of 5.4 km/s? Explain.

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Table 25 Planets Orbital Velocities and Distances from the Sun 5 Mean Distance from Sun million km) 57.9 108.2 149.6 227.9 778.6 1433.5 Orbital Velocity (km/s) 47.4 35.0 29.8 24.1 Planet 9.7 Uranus 4495.0 5,4