Tổng hợp 500 câu trắc nghiệm + tự luận Kinh tế lượng (Elementary Statistics). Tất cả các câu hỏi trắc nghiệm + tự luận đều có đáp án. Nội dung được khái quát trong 13 phần, mỗi phần gồm 3 bài kiểm tra (A, B, C). Các câu hỏi trắc nghiệm + tự luận bám rất sát chương trình kinh tế lượng, đặc biệt là phần thống kê, rất phù hợp cho các bạn củng cố và mở rộng các kiến thức về Kinh tế lượng. Các câu hỏi trắc nghiệm + tự luận của phần 7A bao gồm:
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
1) Under what conditions do you reject H0? Discuss both the traditional and the p-value approach.
For the traditional method, the test statistics is in the critical region. For the p-value method, the p-value is less than or equal to significane level \(\alpha \) and the test statistics is on the proper side in a one-tailed test.
Solve the problem
2) What do you conclude about the claim below? Do not use formal procedures or exact calculations. Use only the rare event rule and make a subjective estimate to determine whether the event is likely.
Claim: An employee of a company is equally likely to take a sick day on any day of the week. Last year, the total number of sick days taken by all the employees of the company was 143. Of these, 52 were Mondays, 14 were Tuesdays, 17 were Wednesdays, 17 were Thursdays, and 43 were Fridays.
If the employees were equally likely to take sick days on any day of the week, the probability of obtaining such a distribution of sick days would be extremely small. Therefore, by the rare event rule, we conclude that the claim that an employee of the company is equally likely to take a sick day on any day of the week is probably not correct.
3) Write the claim that is suggested by given statement, then write a conclusion about the claim. Do not use symbolic expressions or formal procedures; use commond sense.
Last year an appliance manufacturer received many complaints about the high rate of defects among its washing machines. Approximately 9% of the machines were defective in some way. This year the company tightened up its quality control procedures. The lastet shipment of 250 washing machines contained 2 defectives.
The claim is that the defect rate has decreased and is now less than 9%. If the overall defect rate were still 9%, it would be extremely unlikely that a shipment of 250 washing machines would contain as few as 2 defectives. Therefore, the claim that the defect rate has decreased is probably correct.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
Indentify the null hypothesis H0 and the alternative hypothesis H1.
4) A researcher claims that 62% of voters favor gun control
○ H0: p < 0.62
● H0: p = 0.62
○ H0: p \( \ne \) 0.62
○ H0: p \( \ge \) 0.62
Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis.
5) \(\alpha \) = 0.05 for the left-tailed test
Use the given information to find the p-value.
6) The test statistics in a right-tailed test is z = 1.43.