A researcher compares the effectiveness of two different instructional methods for teaching electronics. A sample of 138 students using Method 1 produces a testing average of 61. A sample of 156 students using Method 2 produces a testing average of 64.6. Assume that the population standard deviation for Method 1 is 18.53, while the population standard deviation for Method 2 is 13.43. Determine the 98% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2. Round your answer to one decimal place. Lower endpoint = Upper endpoint =

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