The waiting time between eruptions of the Old Faithful geyser in Yellowstone National Park depends upon the length in time of the last eruption. A representative sample of 10 data pairs for the eruption duration in minutes (x) and the waiting time in minutes till the next eruption (y) appears below. x 4.307 3.977 4.69 4.273 2.277 4.706 2.007 4.127 4.723 1.81 y 81 89 83 79 55 90 49 79 75 53 I USE SALT (a) Find the least-squares line to describe the waiting time as a function of the eruption time. (Round your numerical values to two decimal places.) y = Male crickets chirp by rubbing their front wings together. They chirp faster with increasing temperature and slower with decreasing temperatures. The following table shows the number of chirps per second for a cricket, recorded at 10 different temperatures. Chirps per second 33 27 32 30 30 27 25 29 26 27 Temperature 55 88 73 3 91 85 69 82 75 69 32 83 82 69 83 (c) Find the least-squares line relating the number of chirps to the temperature. (Round your numeric values to three decimal places.) y = (d) If a cricket is monitored at a temperature of 74 degrees, what would you predict his number of chirps would be? (Round your answer to the nearest whole number.) chirps