Chapter 9 Assignment
Case 9.2 Jet’s Pets
Jetadiah Brown wants to establish a pet store called Jet’s Pets. Jet thinks there is an opportunity on the north side of the city, because he knows that many new subdivisions have been built there and many families have since moved in. Plus, he knows there are no pet stores on the north side yet. This growth in the number of families and the lack of competitors suggests a strong business opportunity for Jet’s Pets.
Jet wants to survey the approximately 20,000 families living in the two ZIP code areas that constitute his geographic target market. Of course, he cannot survey all of them, so he must use a sample.
For each of the following possible ways to select a sample of families living in several subdivisions in two ZIP code areas: (1) identify the type of sample method; (2) identify the sample frame; (3) indicate what, if any, sample frame error there is; and (4) indicate the degree to which the resulting sample will be representative of all families living in the two ZIP code areas.
A:  Place questionnaires in veterinarian clinics located in the two ZIP code areas for pet owners to fill out while they are waiting for the doctor to examine their pet.
B: Select every 100th name in the city telephone book; call and interview only those who live in the two ZIP code areas.
C: Use a random number system to select a single subdivision located somewhere in the two ZIP code areas, then place questionnaires in the mailboxes of every home in that subdivision.