Chapter1 Homework

1.  Determine whether the underlined number is a statistic or a parameter.  A sample of employees is selected and it is found that 35% own a vehicle.  Choose the correct statement below.

1. Statistic because the value is a numerical measurement describing a characteristic of a sample.
2. Parameter because the value is a numerical measurement describing a characteristic of a population.
3. Statistic because the value is a numerical measurement describing a characteristic of a population.
4. Parameter because the value is a numerical measurement describing a characteristic of a sample.

2.  Determine whether the given value is a statistic or a parameter.  A homeowner measured the voltage supplied to his home on all 365 days of a given year​, and the average​ (mean) value is 146.5 volts.Choose the correct answer below.

1. The given value is a statistic for the year because the data collected represent a sample.
2. The given value is a parameter for the year because the data collected represent a population.
3. The given value is a statistic for the year because the data collected represent a population.
4. The given value is a parameter for the year because the data collected represent a sample.

3.  A particular country has 45 total states. If the areas of 30 states are added and the sum is divided by 30​, the result is 188,422 square kilometers. Determine whether this result is a statistic or a parameter.  Choose the correct answer below.

1. The result is a statistic because it describes some characteristic of a sample.
2. The result is a parameter because it describes some characteristic of a sample.
3. The result is a parameter because it describes some characteristic of a population.
4. The result is a statistic because it describes some characteristic of a population.

4.  Which of the following is associated with a​ parameter?  Choose the correct answer below.

1. Data that were obtained from a sample.
2. Data that were obtained from an entire population.
3. A numerical measurement describing some characteristic of a sample.
4. Data that were obtained from a voluntary poll at the end of a service call.

5.  The types of movies (drama, comedy, etc.)  Choose the correct answer below.

1. The data are qualitative because they don’t measure or count anything.
2. The data are quantitative because they consist of counts or measurements.
3. The data are qualitative because they consist of counts or measurements.
4. The data are quantitative because they don’t measure or

6.  Which of the following would be classified as categorical​ data?  Choose the correct answer below.

1. Tree height
2. Number of suitcases on a plane
3. Hair color
4. Amount of rainfall

7. Fill in the blank.

​_______ is used when subjects are assigned to different groups through a process of random selection.

8.  Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below.  A researcher selects every 905th social security number and surveys the corresponding person.   Which type of sampling did the researcher ​use?

1. Stratified sampling
2. Convenience sampling
3. Systematic sampling
4. Cluster sampling
5. Random sampling

9.  Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below.  In a poll conducted by a certain research​ center, 783 adults were called after their telephone numbers were randomly generated by a​ computer, and 13% were able to correctly identify the attorney general.

Which type of sampling did the research center​ use?

1. Random sampling
2. Convenience sampling
3. Systematic sampling
4. Stratified sampling
5. Cluster sampling

10.  Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below.  A woman is selected by a marketing company to participate in a paid focus group. The company says that the woman was selected because everyone in five randomly selected towns was being selected.

Which type of sampling did the marketing company​ use?

1. Convenience sampling
2. Systematic sampling
3. Random sampling
4. Stratified sampling
5. Cluster sampling

11.  Identify which type of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster.  To determine customer opinion of their  pricing​, Greyhound Lines randomly selects 80 busses during a certain week and surveys all passengers on the busses. Which type of sampling is​ used?

1. Systematic
2. Random
3. Cluster
4. Convenience
5. Stratified

12.  Identify which of these types of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster. A large company wants to administer a satisfaction survey to its current customers. Using their customer​ database, the company randomly selects 70 customers and asks them about their level of satisfaction with the company.  What type of sampling is​ used?

1. Stratified
2. Random
3. Cluster
4. Convenience
5. Systematic

13.  Identify which of these types of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster.  To determine her body temperature​, Jean divides up her day into three​ parts: morning,​ afternoon, and evening. She then measures her body temperature at 2 randomly selected times during each part of the day.What type of sampling is​ used?

1. Systematic
2. Random
3. Cluster
4. Stratified
5. Convenience

14.   Identify the type of sampling​ used: random,​ systematic, convenience,​ stratified, or cluster.  To estimate the percentage of defects in a recent manufacturing​ batch, a quality control manager at IBM selects every 13th computer that comes off the assembly line starting with the third until she obtains a sample of 90 computers. Which type of sampling is​ used?

1. Cluster
2. Systematic
3. Convenience
4. Stratified
5. Random

15.  Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below. A man experienced a tax audit. The tax department claimed that the man was audited because everyone in five randomly selected districts was being audited.

Which type of sampling did the tax department​ use?

1. Convenience sampling
2. Random sampling
3. Stratified sampling
4. Cluster sampling
5. Systematic sampling

16.  Identify which of these types of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster.  A market researcher has randomly selected four businesses in a certain region. She is surveying all the employees from each business.   What type of sampling is​ used?

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

17.  Identify which type of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster. A magazine asks its readers to call in their opinion regarding the quality of the articles.  Which type of sampling is​ used?

1. Cluster
2. Convenience
3. Systematic
4. Random
5. Stratified

18.  Which sampling method divides the population up into​ sections, randomly selects some of those​ sections, then chooses all the members from the selected sections to​ study? Choose the correct answer below.

1. Systematic
2. Cluster
3. Stratified
4. Convenience

19.  Which sampling method subdivides the population into categories sharing similar characteristics and then selects a sample from each​ subdivision?  Choose the correct answer below.

1. Cluster
2. Convenience
3. Stratified
4. Systematic

20.  Which of the following corresponds to the case when every sample of size n has the same chance of being​ chosen?  Choose the correct answer below.

1. Random sample
2. Probability sample
3. Experiment
4. Simple random sample

21.    Determine whether the given description corresponds to an observational study or an experiment.  In a study of 401 children with a particular​ disease, the subjects were monitored with an EEG while asleep. Does the given description correspond to an observational study or an​ experiment?

1. The given description corresponds to an observational study.
2. The given description corresponds to an experiment.
3. The given description does not provide enough information to answer this question.

22.  Determine whether the description corresponds to an observational study or an experiment.  Fifty patients with colon cancer are divided into two groups. One group receives an experimental drug to fight cancer, the other a placebo. After one year, the spread of the cancer is measured.

Does the description correspond to an observational study or an​ experiment?

1. Experiment
2. Observational Study

23.  A study is conducted to measure​ children’s growth rates without any treatment applied to the children. What best classifies this​ study?  Choose the correct answer below.

1. Discrete data
2. Simple random sample
3. Observational study
4. Experiment