Exercise 4 According to the Mothers Against Drunk Driving (MADD) website, one in three people will be involved in an alcohol related crash. To investigate this issue statistically, a Sociologist randomly sampled 2856 people and discovered that 941 of them had been involved in an alcohol related crash. Based on the results obtained by the Sociologist, is the proportion mentioned on the MADD website valid at the 5% level of significance?