500 câu trắc nghiệm Kinh tế lượng – 1B

SHORT ANSWER.

Write the word or phrase that best completes each statement or answers the question.
Identify the sample and population. Also, determine whether the sample is likely to be representative of the population.

6) 100,000 randomly selected adults were asked whether they drink at least 48 oz of water each day and only 45% said yes.

Sample: the 10,000 selected adults; population: all adults; representative

Use critical thinking to develop an alternative conclusion.

7) In a study of headache patients, every one of the study subjects with a headache was found to be mproved after taking a week off of work. Conclusion: Taking time off work cures headaches.

Headaches generally last for only a few hours, so anything would seem like a cure. There is no evidence to suggest that taking time off work will cure a headache.

Use critical thinking to address the key issue.

8) A researcher published this survey result: “74% of people would be willing to spend 10 percent more for energy from a non-polluting source”.

The survey question was announced on a national radio show and 1,200 listeners responded by calling in. What is wrong with this survey?
This is not a random sample. The survey is based on voluntary, self-selected responses and therefore has serious potential for bias.

9) “38% of adults in the United States regularly visit a doctor”. This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. What is wrong with her survey?

The sample is biased. College students are not representative of the U.S. population as a whole.

MULTIPLE CHOICE.

Choose the one alternative that best completes the statement or answers the question.
Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary.

10) Convert 8.4% to an equivalent fraction and decimal.

○ 2/25; 0.84
○ 21/250; 0.84
○ 2/25; 0.084
● 21/250; 0.084

Solve the problem.

11) Alex and Juana went on a 120-mile canoe trip with their class. On the first day they traveled 30 miles. What percent of the total distance did they canoe?
○ 4%
○ 0.25%
● 25%
○ 400%

Is the study experimental or observational?

12) A political pollster reports that his candidate has a 10% lead in the polls with 10% undecided.
○ Experimental
● Observational