Identify which value represents the sample mean and which value represents the claimed population mean. a) American households spent an average of about $59 in 2007 on Halloween merchandise such as costumes, decorations and candy. To see if this number had changed, researchers conducted a new survey in 2008 before industry numbers were reported. The survey included 1250 households and found that average Halloween spending was $53 per household. The sample mean is dollars, while the claimed population mean is dollars. b) The average GPA of students in 2001 at a private university was 3.59. A survey on a sample of 170 students from this university yielded an average GPA of 3.67 in Spring semester of 2012. The sample mean is and the claimed population mean is