Statistics Readiness: Chapter 1 Sections 1.3/1.4

A internet site asks its members to call in their opinion regarding their web searching habits. What type of sampling is​ used? A. Cluster B. Simple random C. Convenience D. Stratified E. Systematic

C. Convenience

To estimate the percentage of defects in a recent manufacturing​ batch, a quality control manager at Toshiba selects every 19th laptop that comes off the assembly line starting with the fifth until she obtains a sample of 80 Laptops. What type of sampling is​ used? A. Simple random B. Cluster C. Convenience D. Systematic E. Stratified

D. Systematic

To determine her air quality​, Denise divides up her day into three​ parts: morning,​ afternoon, and evening. She then measures her air quality at 2 randomly selected times during each part of the day. What type of sampling is​ used? A. Cluster B. Stratified C. Simple random D. Systematic E. Convenience

B. Stratified

To determine customer opinion of their food quality​, General Foods randomly selects 80 city blocks during a certain week and surveys all homes within the city blocks. What type of sampling is​ used? A. Simple random B. Convenience C. Stratified D. Systematic E. Cluster

E. Cluster

IBM wants to administer a satisfaction survey to its current customers. Using their customer​ database, the company randomly selects 80 customers and asks them about their level of satisfaction with the company. What type of sampling is​ used? A. Convenience B. Stratified C. Simple random D. Systematic E. Cluster

C. Simple random

A salesperson obtained a systematic sample of size 25 from a list of 500 clients. To do​ so, he randomly selected a number from 1 to 20​, obtaining the number 13. He included in the sample the 13th client on the list and every 20th client thereafter. List the numbers that correspond to the 25 clients selected. Choose the correct answer below. A. 13​, 33​, ​..., 493 B. 25​, 45​, ​..., 500 C. 13​, 33​, ​..., 488 D. 20​, 33​, ​..., 332

A. 13​, 33, ​..., 493

A(n) ___________ is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups. A. stratified sample B. convenience sample C. cluster sample D. systematic sample E. simple random sample

C. cluster sample

Which sampling method does not require a​ frame? A. Systematic B. Cluster C. Simple random D. Stratified E. All of the above sampling methods require a frame

A. Systematic

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. Party 1 Party 2 Bolden Nolan Cooper Ochs Carter Pawlak Engler Rice Haydra Tate Keating Thomas Lukens Wright May Weber Which of the following is a possible list of club members to lead the panel​ discussion? A. Wright​, Haydra​, Thomas​, May B. Thomas​, May​, Weber​, Rice C. Thomas​, May​, Weber​, Wright D. Wright​, Haydra​, Pawlak​, Thomas E. Wright​, Haydra​, Pawlak​, Nolan

A. Wright​, Haydra​, Thomas​, May

Determine whether the following statement is true or false. Explain. Inferences based on voluntary response samples are generally not reliable. Choose the correct answer below. A. ​False, because individuals who volunteer are least likely to have personal bias. B. ​True, because it is often the case that the individuals who volunteer do not accurately represent the population. C. ​True, because the group that volunteers may not be a large enough sample size. D. ​False, because a surveyor cannot force volunteers to respond.

B. ​True, because it is often the case that the individuals who volunteer do not accurately represent the population

A(n) _____________ is obtained by dividing the population into homogeneous groups and randomly selecting individuals from each group. A. cluster sample B. systematic sample C. stratified sample D. convenience sample E. simple random sample

C. stratified sample

Determine whether the following statement is true or false. Explain. A simple random sample is always preferred because it obtains the same information as other sampling plans but requires a smaller sample size. Choose the correct answer below. A. ​True, because it does not require extra preparation and can return more information than the other sampling techniques. B. ​False, because simple random samples require a larger sample size than most other sampling methods. C. ​True, because every individual has an equal chance of selection. D. ​False, because other sampling techniques may provide more information for less cost than a simple random sample.

D. ​False, because other sampling techniques may provide more information for less cost than a simple random sample.

The human resource department at a certain company wants to conduct a survey regarding worker benefits. The department has an alphabetical list of all 4405 employees at the company and wants to conduct a systematic sample of size 50. ​(a) What is k​? ​(b) Determine the individuals who will be administered the survey. Randomly select a number from 1 to k. Suppose that we randomly select 4. Starting with the first individual​ selected, the individuals in the survey will be?

A. K = 88 B. 4, 92, 180,....4316.