本次美国代考主要为数学相关的限时测试

1) 在一项调查中,有 20 人被问及他们在上一年购买了多少杂志。这
b) 什么是中位数?模式是什么?
c) 直方图是否扭曲?往什么方向?
结果如下所示。
a)- 构建直方图来表示数据。使用类宽度为 10 的 4 个类,并从较低的开始
-0.5 的等级限制。
6 15 3 36 25 18 12 18 5 30 24 7 0 22 33 24 19 4 12 9

25 35 43 44 47 48 54 55 56 57 59 62 63 65 66 68 69 69 71 72
72 73 74 76 77 77 78 79 80 81 81 82 83 85 89 92 93 94 97 98
a) 确定构建 plotbox 的所有元素,然后从下一页中选择适合的元素
正确的图形(没有绘图)。
b) 是否有异常值?
2) 为给定数据构建箱线图。在所有箱线图中包括 5 数字汇总的值。
下面列出了 40 名学生的考试成绩。

3)
请参阅总结某种疾病检测结果的表格。
阳性测试
结果
阴性测试
结果
对象患有疾病 111 4
受试者没有患病 11 172
a) 填写应急表
如果随机选择结果之一,那么概率是多少:
b) 他有病
c) 他患有疾病或结果呈阳性。
d) 他的结果是假阴性(测试表明该人没有患病,而实际上他们有)?
e) 鉴于结果为阴性,他患有疾病。

1) In a survey, 20 people were asked how many magazines they had purchased during the previous year. The
b) What is Median? What is the mode?
c) Is the histogram scewed? to what direction?
results are shown below.
a)- 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.
6 15 3 36 25 18 12 18 5 30 24 7 0 22 33 24 19 4 12 9

25 35 43 44 47 48 54 55 56 57 59 62 63 65 66 68 69 69 71 72
72 73 74 76 77 77 78 79 80 81 81 82 83 85 89 92 93 94 97 98
a) Determine all the element to built a plotbox, then select the one from the next page that fits the
correct graph (without drawing).
b) are there any outliers?
2) Construct a boxplot for the given data. Include values of the 5-number summary in all boxplots.
The test scores of 40 students are listed below.

3)
Refer to the table which summarizes the results of testing for a certain disease.
Positive Test
Result
Negative Test
Result
Subject has the disease 111 4
Subject does not have the disease 11 172
a) Complete the contengency table
If one of the results is randomly selected, what is the probability that:
b) He has the disease
c) He has the disease or the result is positive.
d) His result is a false negative (test indicates the person does not have the disease when in fact they do)?
e) He has the disease given the the result was negative.


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