Unit 1 SECTION 1.4 SIMPLE RANDOM SAMPLING
7 1.4.15 IBM wants to administer a satisfaction survey to its current customers. Using their customer database, the company randomly selects 60 customers and asks them about their level of satisfaction with the company. ◙ What type of sampling is used?
Simple random .
9. 1.4.21 To determine her breathing rate, Jean divides up her day into three parts: morning, afternoon, and evening. She then measures her breathing rate at 22 randomly selected times during each part of the day. ◙ What type of sampling is used?
Stratified .
1. 1.4.2 Which sampling method does not require a frame? .
Systematic .
5. 1.4.11 To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at Sony selects every 20th music CD that comes off the assembly line starting with the second until she obtains a sample of 70 music CDs .
Systematic .
4. 1.4.9 Determine whether the following statement is true or false. ◙Inferences based on voluntary response samples are generally not reliable. .
True, because it is often the case that the individuals who volunteer do not accurately represent the population. .
10. 1.4.25 A club wants to sponsor a panel discussion on an upcoming election. The club wants to have four of its members lead the panel discussion. To be fair, however, the panel should consist of two members of each party. Below is a list of members in each party. Obtain a stratified sample of two people from party 1 and two from party 2. .
Which of the following is a possible list of club members to lead the panel discussion? Boldenis= party 1 Tate= party 1 Engler= party 2 Keating= party 2 .
2. 1.4.4 A(n) cluster sample is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups. .
cluster sample .
3. 1.4.5 A(n) stratified sample is obtained by dividing the population into homogeneous groups and randomly selecting individuals from each group.
stratified sample
6. 1.4.13 To determine customer opinion of their safety features, Toyota randomly selects 80 dealerships during a certain week and surveys all customers visiting the dealerships. ◙ What type of sampling is used? .
Cluster .
8. 1.4.16 A television station asks its viewers to call in their opinion regarding the desirability of programs in high definition TV. ◙ What type of sampling is used?
Convenience .
