1. A stem-and-leaf diagram is constructed by separating each value of a data set into two parts. What are these parts?

​Stem consisting of the last digit and leaf consisting of the leftmost digits

​Stem consisting of the second digit and leaf consisting of the last digit

​Stem consisting of the leftmost digits and leaf consisting of the second digit

​Stem consisting of the leftmost digits and leaf consisting of the last digit

 2. ​ABC Plumbing wants to understand its customers’ perceptions of the quality of the company’s plumbing service calls. They plan to survey a sample of its customer base. What will ABC need to do to ensure that their data is valid and reliable?

​The survey must include items that ask customers to rate the appearance of the plumbing store, the survey must include all customers, and the survey method must include setting up a table outside the local dollar store.

​The survey must include items that ask customers about their plumbing experiences, the survey sample must include the first 15 customers off the customer database, and the survey method must be repeatable.

​The survey must include items that ask customers to rate the quality of plumbing service calls, the survey sample must represent all parts of the customer population, and the survey method must be repeatable.

​The survey must include items that ask customers to rate the friendliness of the receptionist, the survey must include all customers from the north side of the city, and the survey method must appeal to all respondents.

3. ​Which of the following represents a population and a sample from that population?

​Freshmen at St. Joseph’s University and basketball players at St. Joseph’s University

​Fans at a concert who purchase t-shirts and fans at a concert who purchase soda

​Teachers in a high school and members of the parent teacher group

​Residents of Albany, New York, and registered voters in Albany, New York

​4. A recent survey of 200 small firms (annual revenue less than $10 million) asked whether an increase in the minimum wage would cause the firm to decrease capital spending. Possible responses to the survey question were: “Yes,” “No,” or “Don’t Know.” These data are best classified as ____________. 

​Nominal Scale

​Ratio Scale

​Interval Scale

​Ordinal Scale

5. Which of the following variables is quantitative?​

​Marital Status

​​Temperature

​Religious Affiliation

​Gender

 6. A population consists of _________________.

​a subject of interest in a statistical problem

​all items of interest in a statistical problem

​all items of interest in a sample

​a subject of interest in a sample

7. ​Which of the following variables is qualitative? 

Weight

​Gender

​Temperature

​Height

8. ​The accompanying chart shows the numbers of books written by each author in a collection of cookbooks. What type of chart is this?

​Bar chart for qualitative data

​Frequency histogram for qualitative data

​Frequency histogram for quantitative data

​Bar chart for quantitative data

9. ​In order to summarize qualitative data a useful tool is a __________. 

​Histogram

​Stem-and-Leaf Diagram

​Line Graph

​Frequency Distribution