How does an increase in the number of observations affect the t ratio and the standard error a. The t ratio increases, and the standard error decreases. b. The tratio decreases, and the standard error increases. c. The t ratio decreases, and the standard error decreases. d. The t ratio increases, and the standard error increases. The larger our standard error of estimates, a. the larger the R² b. c. the smaller the R² d. the larger the tratio the smaller the tratio

Planetary Velocity The following table gives the mean velocity of planets in their orbits versus their mean distance from the sun. Note that 1AU astronomical unit is the mean distance from Earth to the sun, abut 93 million miles. Planet d=distance AU v=velocity km/sec Mercury 0.39 47.4 Venus 0.72 35.0 Earth 1.00 29.8 Mars 1.52 24.1 Jupiter 5.20 13.1 Saturn 9.58 9.7 Uranus 19.20 6.8 Neptune 30.05 5.4 Astronomers tell us that it is reasonable to model these data with a power function. a Use power regression to express velocity as a power function of distance from the sun. b Plot the data along with the regression equation. c An asteroid orbits at a mean distance of 3AU from the sun. According to the power model you found in part a, what is the mean orbital velocity of the asteroid?

Find the equation of the regression line for the following data set. x 1 2 3 y 0 3 4