Question: 3. a. Use a 0.05 significance level to test for a linear correlation between the cost of electricity and the kWh of electricity consumed. b.

3.

a. Use a 0.05 significance level to test for a linear correlation between the cost of electricity and the kWh of electricity consumed.

b. What percentage of the variation in cost can be explained by the linear relationship between electricity consumption (in kWh) and cost?

c. Find the equation of the regression line that expresses cost (y) in terms of the amount of electricity consumed (in kWh).

d. What is the best predicted cost for a time when 3000 kWh of electricity is used?

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