1. Give brief definitions of the terms descriptive statistics and inferential statistics.

2. The following conclusion from a study appeared in the article "Smartphone Nation" (AARP Bulletin, September 2009) : "If you love your smart phone, you are not alone. Half of all boomers sleep with their cell phone within arm's length. Two of three people age 50 to 64 use a cell phone to take photos, according to a 2010 Pew Research Center report." Are the given proportions (half and two of three) population values, or were they calculated from a sample?

3. The student senate at a university with 15,000 students is interested in the proportion of students who favor a change in the grading system to allow for plus and minus grades (for example, B+ , B, B- , rather than just B). Two hundred students are interviewed to determine their attitude toward this proposed change.

a) What is the population of interest?

b)What group of students constitutes the sample in this problem?

4. The supervisors of a rural county are interested in the proportion of property owners who support the construction of a sewer system. Because it is too costly to contact all 7000 property owners, a survey of 500 owners is undertaken. Describe the population and sample for this problem.