Question 4 (Cont ) (c) The marketing manager of a company studies the market penetration of a new product. A telephone survey is conducted and the following two-way classification table shows the data about income level and market penetration. Market penetration Income level Never heard of Heard about it Bought it at the product but did not buy least once High 35 84 51 Middle 49 78 23 Low 10 13 6 Do these data indicate that income level and market penetration are independent at 1% level of significance? [7 marks]