1. You are conducting a study of students doing work-study jobs on your campus. Among the questions on the survey instrument are:

How many hours are you scheduled to work each week? Answer to the nearest hour.

How applicable is this work experience to your future employment goals? Respond using the following scale: 1 not at all, 2 somewhat, 3 very applicable Answer the following:

a) Suppose you take random samples from the following groups: freshmen, sophomores, juniors, and seniors. What kind of sampling technique are you using (simple random, stratified, systematic, cluster, multistage, convenience)?

b) Describe the individuals of this study.

c) What is the variable for question A? Classify the variable as qualitative or quantitative. What is the level of the measurement?

d) What is the variable for question B? Classify the variable as qualitative or quantitative. What is the level of the measurement?

e) Is the proportion of responses "3 very" to question B a statistic or a parameter?

f) Suppose only 40% of the students you selected for the sample respond. What is the nonresponse rate? Do you think the nonresponse rate might introduce bias into the study? Explain.

g) Would it be appropriate to generalize the results of your study to all work-study students in the nation? Explain

2. Write a brief answer to each of the following:

a) What does it mean to say that we are going to use a sample to draw an inference about a population?

b) Why is a random sample so important for this process?

c) If we wanted a random sample of students in the cafeteria, why couldn't we just choose the students who order Diet Pepsi with their lunch?

d) Comment on the statement, "A random sample is like a miniature population, whereas samples that are not random are likely to be biased."

e) Why would the students who order Diet Pepsi with lunch not be a random sample of students in the cafeteria?

3. How do you determine the level of measurement?

4. What does the level of measurement tell us?

5. Classify the following variables as nominal, ordinal, interval, or ratio. Height of a bridge GPA (Grade Point Average) Hours worked per week Type of pets owned Letter grade in class Body temperature Age in years Marital status Dates you attended school