Suppose that in a certain chemical process the reaction time y (hr) is related to the temperature (°F) in the chamber in which the reaction takes place according to the simple linear regression model with equation y = 4.90 0.01x and σ = 0.08. USE SALT (a) What is the expected change in reaction time for a 1°F increase in temperature? For a 9°F increase in temperature? 1°F increase -0.01 hr hr 9°F increase -0.09 (b) What is the expected reaction time when temperature is 190°F? When temperature is 260°F? 190°F 3 ✔hr hr 260°F 2.3 (c) Suppose five observations are made independently on reaction time, each one for a temperature of 260°F. What is the probability that all five times are between 2.19 and 2.41 hours? (Round your answer to four decimal places.) 0.8324 X (d) What is the probability that two independently observed reaction times for temperatures 1° apart are such that the time at the higher temperature exceeds the time at the lower temperature? (Round your answer to four decimal places.) 0.4641

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