In the equation of the trend line \( y = 1.50x + 20 \):
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The slope (1.50) represents the amount you earn for each phone assembled. Specifically, it means that for every phone you assemble, you earn an additional $1.50.
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The y-intercept (20) represents the base amount you earn regardless of the number of phones assembled. In this case, it means you receive $20 a day, even if you do not assemble any phones.
Therefore, the correct interpretation is:
The slope means that, for every phone assembled, you receive $1.50. The y-intercept means that you receive $20 a day regardless of the number of phones produced.