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We made an experiment in class where we measured the evolution of temperature over the course of 5 weeks.

I'd like to show that the increase in temperature is accelerating as summer is coming.

Is it enough to calculate the slope of the linear trend over the full 5 weeks and show that it is smaller than the slope of the linear trend over the past week (increase in trends) to deduce that it is accelerating ?

I'm asking because my teacher said that comparing linear trends over different time periods is not always appropriate and can be biased, but i don't understand why.

Thanks.

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# Temperature and trend

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