Question: It is commonly believed that at least 70% of the population feel they can't live without their smartphones. To test this belief, a group of sociologists surveyed 750 smartphone users. It showed that 510 of them said they could not live without their smartphone. Use a 0.10 significance level, and the p-value method, to test the claim of the sociologists that the proportion of people who say they can't live without their smartphone is less than 70%. Which is correct, the common belief or the group of sociologists? Justify your response)