Chapter 1 - Problems to look at
Name___________________________________
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Determine whether the numerical value is a parameter or a statistic. Explain your reasoning.
1) A recent survey by the alumni of a major university indicated that the average salary of
10,500 of its 175,000 graduates was $95,000.
1)
Statistic because we are using a sample of 10,500 students from the 175,000 avaliable
Identify the population and the sample.
2) A survey of 1378 American households found that 27% of the households own a computer.
2)
Population: All American Households
Sample: 1378 American Households
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Identify whether the statement describes inferential statistics or descriptive statistics.
3) The average age of the students in a statistics class is 19 years.
A) descriptive statistics
Answer: A
3)
Answer: B
4)
B) inferential statistics
4) There is a relationship between smoking cigarettes and getting emphysema.
A) descriptive statistics
B) inferential statistics
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
5) Explain the difference between a sample and a population.
5)
A population is all objects or responces of interest.
A sample is a subset of the population.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Determine whether the data are qualitative or quantitative.
6) the colors of automobiles on a used car lot
Answer: A
A) qualitative
6)
B) quantitative
7) the number of seats in a movie theater
Answer: A
A) quantitative
B) qualitative
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7)
Identify the data set's level of measurement.
8) hair color of women on a high school tennis team
A) ratio
Answer: D
B) ordinal
C) interval
9) temperatures of 12 selected refrigerators
A) ratio
D) nominal
Answer: D
B) ordinal
9)
C) nominal
10) the data listed on the horizontal axis in the graph
A) ratio
8)
D) interval
Answer: C
B) interval
C) nominal
10)
D) ordinal
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
11) Explain the differences between the interval and ratio levels of measurement.
11)
Interval level is numeric, can be ordered, differences in the data values are meaningful, and the value of
zero represents a location on a scale and does not mean "none"
Ratio level is similar to interval level except that the ratio of data values is meaningful, one data can
be expresses as a multiple of another and the value of zero means "none"
12) Explain why data expressed with the Celsius temperature scale is at the interval level of
measurement rather than the ratio level.
12)
Celsius temperature is at the interval level because zero degrees celsius does not imply that there is no
heat. It is a location on a scale
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Decide which method of data collection you would use to collect data for the study. Specify either observational
study, experiment, simulation, or survey.
13) A study where a drug was given to 23 patients and a placebo to another group of 23 patients to
determine if the drug has an effect on a patient's illness
Answer: B
A) observational study
B) experiment
C) survey
D) simulation
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13)
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
14) Explain what bias there is in a study done entirely online.
14)
Not everyone has access to a computer or uses the internet
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Identify the sampling technique used.
15) Thirty-five sophomores, 50 juniors and 37 seniors are randomly selected from 538 sophomores, 448
juniors and 394 seniors at a certain high school.
Answer: A
15)
A) stratified
B) convenience
C) cluster
D) systematic
E) random
16) A community college student interviews everyone in a statistics class to determine the percentage of
students that own a car.
Answer: E
A) random
B) cluster
C) stratified
D) systematic
E) convenience
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
17) Explain the differences between cluster sampling and stratified sampling.
Cluster Sample
•
Divide the population into groups (clusters) and select all of the members in one
or more, but not all, of the clusters.
Stratified Sample
•
Divide a population into groups (strata) and select a random sample from each
group.
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17)
16)