AI Tutor
Back to Summarizing data

Exercise 5

Avg difficulty 3.0

Parameters and statistics. Identify which value represents the sample mean and which value represents the claimed population mean.

  1. American households spent an average of about $52 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 1,500 households and found that average Halloween spending was $58 per household.

  2. The average GPA of students in 2001 at a private university was 3.37. A survey on a sample of 203 students from this university yielded an average GPA of 3.59 a decade later.

Diez, Barr & Çetinkaya-Rundel, OpenIntro Statistics, Summarizing data, End-of-Chapter Exercises, Exercise 5

AI Tutor

Adapted from OpenIntro Statistics © 2019 David Diez, Mine Çetinkaya-Rundel & Christopher D. Barr. Licensed under CC BY-SA 3.0. Source: OpenIntro Statistics. Imported at revision fee2509.