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(a) Assume that you have a response Y, that is a linear function of time t. After time t = 20 the slope of the

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(a) Assume that you have a response Y, that is a linear function of time t. After time t = 20 the slope of the line remains the same, but there is a jump/ discontinuity in the line. Specify an appropriate model, identifying all parameters, and give the hypotheses that tests whether the magnitude of jump at t = 20 is statistically significant

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