the output from a simple regression on the relation between machine maintenance cost and number of machine hours is as follows:

Question 23 (1.5 points) The output from a simple regression on the relation between machine maintenance costs (in $) and number of machine hours is as follows: R Square 0.88 Coefficient on intercept is 8,656 (p-value = 0.001) Coefficient on machine hours is 5.38 (p-value = 0.005). The firm uses a cutoff p-value of 0.05 to determine statistical significance. Which of the following is true? (a) The regression equation explains 88% of the variation in machine maintenance costs b) The fixed cost is $8,656 ( c) The variable cost per machine hour is $5.38 ( d) All of the above