A carpenter is increasing his price for projects, claiming that the cost of materials is going up and accounts for 70% of his budget. In a random sample of 49 of his projects, it is found that in 30 of the projects, the cost if material is higher. What is the correct Hypothesis? What is the z - statistic? a. -1.34 b. -2.98 c. -0.76 d. -1.22