The marketing manager of a company carries out a survey by taking a simple random sample from the user population of a particular product which has several competing brands in the market to estimate the market share of this company's brand. He finds that out of 1000 selected in the sample only 247 use his company's brand. Not satisfied with his company's performance he decides, after extensive discussions with his colleagues, to launch a promotion campaign for a month. After one month, he carries out a second survey in which he finds that 512 out of 1500 users of the product use his company's brand. On the basis of the data can the marketing manager conclude that the promotion campaign undertaken by his company has yielded the desired result