Quiz 1

1.  Fill in the blank below. The variable measured in an experiment is called​ _______.

1. a sampling unit
2. the treatment
3. the response variable
4. the predictor variable

2.  Determine whether the study depicts an observational study or an experiment.  A scientist was studying the effects of a new fertilizer on crop yield. She randomly assigned half of the plots on a farm to group one and the remaining plots to group two. On the plots in group​ one, the new fertilizer was used for a year. On the plots in group​ two, the old fertilizer was used. At the end of the year the average crop yield for the plots in group one was compared with the average crop yield for the plots in group two.

1. experiment
2. observational study

3.  Identify the type of sampling used.  ​Thirty-five math​ majors, 36 music majors and 54 history majors are randomly selected from 550 math​ majors, 236 music majors and 450 history majors at the state university. What sampling technique is​ used?

1. convenience
2. stratified
3. cluster
4. systematic
5. simple random

4.   Determine whether the underlined value is a parameter or a statistic.  In a survey conducted in a certain​ town, 27% of adult respondents reported that they had been involved in at least one car accident in the past ten years.

1. parameter
2. statistic

5.  An international relations professor is supervising four​ master’s students. Information about the students is summarized in the table.

Identify the variables and determine whether each variable is quantitative or qualitative.

1. student​ name, qualitative; student​ number, quantitative; area of​ interest, qualitative;​ GPA, quantitative
2. student​ name, qualitative; student​ number, qualitative; area of​ interest, qualitative;​ GPA, qualitative
3. student​ name, qualitative; student​ number, quantitative; area of​ interest, qualitative;​ GPA, qualitative
4. student​ name, qualitative; student​ number, qualitative; area of​ interest, qualitative;​ GPA, quantitative

6.  Which branch of statistics deals with the organization and summarization of collected​ information?

1. Inferential statistics
2. Computational statistics
3. Descriptive statistics
4. Survey design

7.  Fill in the blank below.  ​_______ is a condition applied to the experimental units involved in an experiment.

1. The factor level
2. The design
3. The sampling design
4. A treatment

8.   Determine the level of measurement of the variable.  the native language of a tourist

1. interval
2. ratio
3. nominal
4. ordinal

9.  Determine whether the study depicts an observational study or an experiment.  A poll is conducted in which professional musicians are asked their ages.

1. observational study
2. experiment

10.  Determine whether the underlined value is a parameter or a statistic.  51.9% of the residents of a certain city are female.

1. parameter
2. statistic

11.  Determine whether the quantitative variable is discrete or continuous.  the cholesterol levels of a group of adults

1. discrete
2. continuous

12.  Determine the level of measurement of the variable.  an​ officer’s rank in the military

1. nominal
2. interval
3. ordinal
4. ratio

13.  Determine the level of measurement of the variable.  the year of manufacture of a car

1. nominal
2. interval
3. ordinal
4. ratio

14  Determine whether the quantitative variable is discrete or continuous.  the number of bottles of juice sold in a cafeteria during lunch

1. discrete
2. continuous

15.  Identify the type of sampling used.  Every fifth adult entering an airport is checked for extra security screening. What sampling technique is​ used?

1. convenience
2. systematic
3. simple random
4. stratified
5. cluster

16.  Identify the type of sampling used.  A statistics student is trying to determine the proportion of all people who own cell phones. He interviews everyone in his apartment building to determine who owns a cell phone. What sampling technique was​ used?

1. systematic
2. stratified
3. cluster
4. convenience
5. simple random

17.  Fill in the blank below. Quantitative variables classify individuals in a sample according to​ _______.

1. exhibited trait
2. personality characteristic
3. numerical measure
4. physical attribute