# 500 câu trắc nghiệm Kinh tế lượng – 2C

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 2C bao gồm:

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response.
1) One purpose of displaying data graphically is to provide clues about trends. The given values are weights (ounces) of steaks listed on a restaurant menu as “20 ounce porterhouse” steaks. The weights are supposed to be 21 ounces because they supposedly lose an ounce when cooked. Create a frequency distribution with 5 classes. Based on your distribution, comment on the
17 20 21 18 20 20 20 18 19 19 20 19 21 20 18 20 20 19 18 19

Answers will vary. Yet, the focus is as follows. The class width is 1 based on a range of 4 to accommodate 5 classes. The accompanying frequency distribution shows only two steaks satisfying the description. The other 18 steaks weigh under 21 ounces. Therefore, the ad is incorrect most of the time.

2) We want to compare two different groups of students, students taking Composition 1 in a
traditional lecture format and students taking Composition 1 in a distance learning format. We know that the mean score on the research paper is 85 for both groups. What additional information would be provided by knowing the standard deviation?

Answers will vary. However, the main concept is that the standard deviation tells us whether the scores are clustered about the mean or spread farther apart.

Solve the problem.
3) In a survey, 20 people were asked how many magazines they had purchased during the previous year. The results are shown below. Construct a histogram to represent the data. Use 4 classes with a class width of 10, and begin with a lower class limit of -0.5. What is the approximate amount at the center?

6 15 3 36 25 18 12 18 5 30
24 7 0 22 33 24 19 4 12 9

The approximate amount at the center is 16 magazines.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Use the pie chart to solve the problem.
4) A survey of the 4429 vehicles on the campus of State University yielded the following pie chart.

Find the number of sedans. Round your result to the nearest whole number.
● 310
○ 4119
○ 7
○ 531

Find the mean for the given sample data.
5) The local Tupperware dealers earned these commissions last month:
$4377.47$3183.76 $1970.16$2270.88
$3860.06$2508.55 $1569.64$4205.30 $1663.68$3960.71
What was the mean commission earned? Round your answer to the nearest cent.
○ $3285.58 ○$3696.28
○ $2951.02 ●$2957.02

Find the median for the given sample data.
6) The normal monthly precipitation (in inches) for August is listed for 20 different U.S. cities. Find the median of the data.
3.5 1.6 2.4 3.7 4.1
3.9 1.0 3.6 4.2 3.4
3.7 2.2 1.5 4.2 3.4
2.7 0.4 3.7 2.0 3.6
● 3.45 in.
○ 3.50 in.
○ 3.40 in.
○ 2.94 in.

7) Find the mode(s) for the given sample data: 98, 53, 32, 53, 29, 98
○ 60.5
○ 53
● 98,53
○ 98

Find the midrange for the given sample data.
8) A meteorologist records the number of clear days in a given year in each of 21 different U.S. cities. The results are shown below. Find the midrange.
72 143 52 84 100 98 101
120 99 121 86 60 59 71
125 130 104 74 83 55 169
● 110.5
○ 112
○ 98
○ 117

Solve the problem.
9) A car dealer is deciding what kinds of vehicles he should order from the factory. He looks at his sales report for the preceding period. Choose the vertical scale so that the relative frequencies are represented.

 Vehicle Sales Economy 10 Sports 2.5 Family 17.5 Luxury 5 Truck 15

Select the appropriate Pareto chart to help him decide.

Find the mean of the data summarized in the given frequency distribution.
10) The heights of a group of professional basketball players are summarized in the frequency
distribution below. Find the mean height. Round your answer to one decimal place.

 Height (in.) Frequency 70 – 71 2 72 – 73 7 74 – 75 8 76 – 77 10 78 – 79 10 80 – 81 4 82 – 83 1

○ 13.5 in.
○ 78.0 in.
● 76.2 in.
○ 74.4 in.