Obesity is an increasing problem in America among all age groups. A recent study reported 1276 individuals in a sample of 4115 adults were found to be obese (a body mass index exceeding 30; this index is a measure of weight relative to height). Five years ago, survey based on people's own assessment revealed that 20% of adult Americans considered themselves obese. Does the most recent data suggest that the true proportion of adults who are obese is more than 1.4 times the percentage from the self-assessment survey? Carry out a test using a significance level of 5%. D Question 1 Determine the critical value O z = 1.645 O t- -1.645 O t= 1.96 O z= -1.282 O z - 1.282 O z = 1.96

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