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12.4 Exercise 4

Avg difficulty 2.5

Use the following information to answer the next two exercises. An electronics retailer used regression to find a simple model to predict sales growth in the first quarter of the new year (January through March). The model is good for 90 days, where x is the day. The model can be written as ŷ = 101.32 + 2.48x, where ŷ is in thousands of dollars.

What would you predict the sales to be on day 60?

OpenStax Statistics, 12.4 Prediction (Optional), exercise 4

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