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Consider a Time Series with 15 Quarterly Sales Observations

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Consider a time series with 15 quarterly sales observations. Using the quadratic trend model, the following partial computer output was obtained.
Consider a time series with 15 quarterly sales observations. Using the quadratic trend model, the following partial computer output was obtained. Test the significance of the t<sup>2</sup> term at α =.05. State the critical T value (rejection point) and the p-value. Make your decision using a two-sided null hypothesis. Test the significance of the t2 term at α =.05. State the critical T value (rejection point) and the p-value. Make your decision using a two-sided null hypothesis.

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T = −3.80, p-value = .001, reject H0.
H0: ...

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