Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Provide an appropriate response.
1) Classify the following random variable: telephone area codes 1)
A) quantitative discrete data B) experimental data
C) quantitative continuous data D) qualitative data
Answer: D
2) A drug company wanted to test a new arthritis medication. The researchers found 800 adults aged 2)
25-35 and randomly assigned them to two groups. The first group received the new drug, while
the second received a placebo. After one month of treatment, the percentage of each group whose
arthritis symptoms decreased was recorded and compared. What is the treatment in this
experiment?
A) the 800 adults aged 25-35
B) the drug
C) the percentage who had decreased arthritis symptoms
D) the one month treatment time
Answer: B
Identify the type of sampling used.
3) Thirty-five math majors, 38 music majors and 47 history majors are randomly selected from 206 3)
math majors, 535 music majors and 471 history majors at the state university. What sampling
technique is used?
A) systematic
B) simple random
C) cluster
D) stratified
E) convenience
Answer: D
Provide an appropriate response.
4) The object upon which the response variable is measured is called ________ . 4)
A) the factor B) a treatment
C) the predictor variable D) an experimental unit
Answer: D
5) The peak shopping time at a pet store is between 8-11:00 am on Saturday mornings. Management 5)
at the pet store randomly selected 155 customers last Saturday morning and decided to observe
their shopping habits. They recorded the number of items that a sample of the customers purchased
as well as the total time the customers spent in the store. Identify the types of variables recorded by
the pet store.
A) number of items - continuous; total time - discrete
B) number of items - discrete; total time - continuous
C) number of items - continuous; total time - continuous
D) number of items - discrete; total time - discrete
Answer: B
1
,Determine whether the quantitative variable is discrete or continuous.
6) the number of bottles of juice sold in a cafeteria during lunch 6)
A) continuous B) discrete
Answer: B
Determine whether the underlined value is a parameter or a statistic.
7) 51.4% of the residents of Idlington Garden City are female. 7)
A) statistic B) parameter
Answer: B
Provide an appropriate response.
8) The number of violent crimes committed in a city on a given day in a random sample of 80 days is a 8)
__________ random variable.
A) continuous B) discrete
Answer: B
Determine whether the underlined value is a parameter or a statistic.
9) Telephone interviews of 336 employees of a large electronics company found that 75% were 9)
dissatisfied with their working conditions.
A) statistic B) parameter
Answer: A
Determine whether the study depicts an observational study or an experiment.
10) A pollster obtains a sample of students and asks them how they will vote on an upcoming 10)
referendum.
A) observational study B) experiment
Answer: A
Provide an appropriate response.
11) Parking at a large university has become a very big problem. University administrators are 11)
interested in determining the average parking time (e.g. the time it takes a student to find a parking
spot) of its students. An administrator inconspicuously followed 290 students and carefully
recorded their parking times. Identify the population of interest to the university administration.
A) the entire set of faculty, staff, and students that park at the university
B) the parking times of the entire set of students that park at the university
C) the parking times of the 290 students from whom the data were collected
D) the students that park at the university between 9 and 10 AM on Wednesdays
Answer: B
12) The legal profession conducted a study to determine the percentage of cardiologists who had been 12)
sued for malpractice in the last ten years. The sample was randomly chosen from a national
directory of doctors. Identify the individuals in the study.
A) the responses: have been sued/have not been sued for malpractice in the last ten years
B) all cardiologists in the directory
C) each cardiologist selected from the directory
D) the doctor's area of expertise (i.e., cardiology, pediatrics, etc.)
Answer: C
2
, Determine what type of observational study is described. Explain.
13) Researchers wanted to determine whether there was an association between high blood pressure 13)
and the suppression of emotions. The researchers looked at 1800 adults enrolled in a Health
Initiative Observational Study. Each person was interviewed and asked about their response to
emotions. In particular they were asked whether their tendency was to express or to hold in anger
and other emotions. The degree of suppression of emotions was rated on a scale of 1 to 10. Each
person's blood pressure was also measured. The researchers analyzed the results to determine
whether there was an association between high blood pressure and the suppression of emotions.
A) cross-sectional; Information is collected at a specific point in time.
B) retrospective; Individuals are asked to look back in time.
C) cohort; Individuals are observed over a long period of time.
Answer: A
Determine the level of measurement of the variable.
14) time spent playing basketball 14)
A) interval B) ordinal C) ratio D) nominal
Answer: C
Provide an appropriate response.
15) A student is asked to rate a guest speaker's ability to communicate on a scale of 15)
poor-average-good-excellent. The student is to fill in a corresponding circle on a bubble form.
This is an example of collecting what type of data?
A) qualitative B) insightful C) discrete D) continuous
Answer: A
16) True or False: Experiments assist the researcher in isolating the causes of the relationships that exist 16)
between two variables.
A) True B) False
Answer: A
Determine whether the underlined value is a parameter or a statistic.
17) A study of 1700 college students in the city of Pemblington found that 11% had been victims of 17)
violent crimes.
A) statistic B) parameter
Answer: A
Provide an appropriate response.
18) Which of the following is not true about factors? 18)
A) Factors whose effect on the response variable is not of interest can be set after the experiment.
B) Any combination of the values of the factors is called a treatment.
C) One way to control factors is to fix their level at one predetermined value throughout the
experiment.
D) Factors whose effect on the response variable interests us should be set at predetermined
levels.
Answer: A
19) An experiment in which the experimental unit (or subject) does not know which treatment he or 19)
she is receiving is called a ________________ .
A) single-blind experiment B) randomized block design
C) double-blind experiment D) matched-pairs design
Answer: A
3
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Provide an appropriate response.
1) Classify the following random variable: telephone area codes 1)
A) quantitative discrete data B) experimental data
C) quantitative continuous data D) qualitative data
Answer: D
2) A drug company wanted to test a new arthritis medication. The researchers found 800 adults aged 2)
25-35 and randomly assigned them to two groups. The first group received the new drug, while
the second received a placebo. After one month of treatment, the percentage of each group whose
arthritis symptoms decreased was recorded and compared. What is the treatment in this
experiment?
A) the 800 adults aged 25-35
B) the drug
C) the percentage who had decreased arthritis symptoms
D) the one month treatment time
Answer: B
Identify the type of sampling used.
3) Thirty-five math majors, 38 music majors and 47 history majors are randomly selected from 206 3)
math majors, 535 music majors and 471 history majors at the state university. What sampling
technique is used?
A) systematic
B) simple random
C) cluster
D) stratified
E) convenience
Answer: D
Provide an appropriate response.
4) The object upon which the response variable is measured is called ________ . 4)
A) the factor B) a treatment
C) the predictor variable D) an experimental unit
Answer: D
5) The peak shopping time at a pet store is between 8-11:00 am on Saturday mornings. Management 5)
at the pet store randomly selected 155 customers last Saturday morning and decided to observe
their shopping habits. They recorded the number of items that a sample of the customers purchased
as well as the total time the customers spent in the store. Identify the types of variables recorded by
the pet store.
A) number of items - continuous; total time - discrete
B) number of items - discrete; total time - continuous
C) number of items - continuous; total time - continuous
D) number of items - discrete; total time - discrete
Answer: B
1
,Determine whether the quantitative variable is discrete or continuous.
6) the number of bottles of juice sold in a cafeteria during lunch 6)
A) continuous B) discrete
Answer: B
Determine whether the underlined value is a parameter or a statistic.
7) 51.4% of the residents of Idlington Garden City are female. 7)
A) statistic B) parameter
Answer: B
Provide an appropriate response.
8) The number of violent crimes committed in a city on a given day in a random sample of 80 days is a 8)
__________ random variable.
A) continuous B) discrete
Answer: B
Determine whether the underlined value is a parameter or a statistic.
9) Telephone interviews of 336 employees of a large electronics company found that 75% were 9)
dissatisfied with their working conditions.
A) statistic B) parameter
Answer: A
Determine whether the study depicts an observational study or an experiment.
10) A pollster obtains a sample of students and asks them how they will vote on an upcoming 10)
referendum.
A) observational study B) experiment
Answer: A
Provide an appropriate response.
11) Parking at a large university has become a very big problem. University administrators are 11)
interested in determining the average parking time (e.g. the time it takes a student to find a parking
spot) of its students. An administrator inconspicuously followed 290 students and carefully
recorded their parking times. Identify the population of interest to the university administration.
A) the entire set of faculty, staff, and students that park at the university
B) the parking times of the entire set of students that park at the university
C) the parking times of the 290 students from whom the data were collected
D) the students that park at the university between 9 and 10 AM on Wednesdays
Answer: B
12) The legal profession conducted a study to determine the percentage of cardiologists who had been 12)
sued for malpractice in the last ten years. The sample was randomly chosen from a national
directory of doctors. Identify the individuals in the study.
A) the responses: have been sued/have not been sued for malpractice in the last ten years
B) all cardiologists in the directory
C) each cardiologist selected from the directory
D) the doctor's area of expertise (i.e., cardiology, pediatrics, etc.)
Answer: C
2
, Determine what type of observational study is described. Explain.
13) Researchers wanted to determine whether there was an association between high blood pressure 13)
and the suppression of emotions. The researchers looked at 1800 adults enrolled in a Health
Initiative Observational Study. Each person was interviewed and asked about their response to
emotions. In particular they were asked whether their tendency was to express or to hold in anger
and other emotions. The degree of suppression of emotions was rated on a scale of 1 to 10. Each
person's blood pressure was also measured. The researchers analyzed the results to determine
whether there was an association between high blood pressure and the suppression of emotions.
A) cross-sectional; Information is collected at a specific point in time.
B) retrospective; Individuals are asked to look back in time.
C) cohort; Individuals are observed over a long period of time.
Answer: A
Determine the level of measurement of the variable.
14) time spent playing basketball 14)
A) interval B) ordinal C) ratio D) nominal
Answer: C
Provide an appropriate response.
15) A student is asked to rate a guest speaker's ability to communicate on a scale of 15)
poor-average-good-excellent. The student is to fill in a corresponding circle on a bubble form.
This is an example of collecting what type of data?
A) qualitative B) insightful C) discrete D) continuous
Answer: A
16) True or False: Experiments assist the researcher in isolating the causes of the relationships that exist 16)
between two variables.
A) True B) False
Answer: A
Determine whether the underlined value is a parameter or a statistic.
17) A study of 1700 college students in the city of Pemblington found that 11% had been victims of 17)
violent crimes.
A) statistic B) parameter
Answer: A
Provide an appropriate response.
18) Which of the following is not true about factors? 18)
A) Factors whose effect on the response variable is not of interest can be set after the experiment.
B) Any combination of the values of the factors is called a treatment.
C) One way to control factors is to fix their level at one predetermined value throughout the
experiment.
D) Factors whose effect on the response variable interests us should be set at predetermined
levels.
Answer: A
19) An experiment in which the experimental unit (or subject) does not know which treatment he or 19)
she is receiving is called a ________________ .
A) single-blind experiment B) randomized block design
C) double-blind experiment D) matched-pairs design
Answer: A
3
