moocIntroduction To Statitics期末答案(mooc完整答案)
68 min readmoocIntroduction To Statitics期末答案(mooc完整答案)
online weekly quiz (week three)
1、末答A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The案m案 stem-and-leaf display of the data is shown below. What percentage of the respondents rated overall television quality with a rating of 80 or above?
A、0
B、整答4
C、末答96
D、案m案100
2、整答A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The末答 stem-and-leaf display of the data is shown below. What percentage of the respondents rated overall television quality with a rating of 50 or below? Stem Leaves 3 2 3 4 0 3 4 7 8 9 9 9 5 0 1 1 2 3 4 5 6 1 2 5 6 6 7 0 1 8 9 2
A、11
B、案m案40
C、整答44
D、末答56
3、案m案A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The整答 stem-and-leaf display of the data is shown below. What percentage of the respondents rated overall television quality with a rating from 50 through 75? Stem Leaves 3 2 3 4 0 3 4 7 8 9 9 9 5 0 1 1 2 3 4 5 6 1 2 5 6 6 7 0 1 8 9 2
A、11
B、末答40
C、案m案44
D、整答56
4、Every spring semester, the School of Business coordinates a luncheon with local business leaders for graduating seniors, their families, and friends. Corporate sponsorship pays for the lunches of each of the seniors, but students have to purchase tickets to cover the cost of lunches served to guests they bring with them. The following histogram represents the attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheon and f is the number of graduating seniors in each category. how many graduating seniors attended the luncheon?
A、4
B、152
C、275
D、388
5、Every spring semester, the School of Business coordinates a luncheon with local business leaders for graduating seniors, their families, and friends. Corporate sponsorship pays for the lunches of each of the seniors, but students have to purchase tickets to cover the cost of lunches served to guests they bring with them. The following histogram represents the attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheon and f is the number of graduating seniors in each category. If all the tickets purchased were used, how many guests attended the luncheon?
A、4
B、152
C、275
D、388
6、A professor of economics at a small Texas university wanted to determine what year in school students were taking his tough economics course. Shown below is a pie chart of the results. What percentage of the class took the course prior to reaching their senior year?
A、14%
B、44%
C、54%
D、86%
7、When polygons or histograms are constructed, which axis must show the true zero or "origin"?
A、the horizontal axis
B、the vertical axis
C、both the horizontal and vertical axes
D、neither the horizontal nor the vertical axis
8、When constructing charts, the following is plotted at the class midpoints:
A、frequency histograms.
B、percentage polygons.
C、cumulative percentage polygon (ogives).
D、all of the above
9、1. True or False: Given below is the scatter plot of the price/earnings ratio versus earnings per share of 20 U.S. companies. There appear to be a positive relationship between price/earnings ratio and earnings per share.
10、True or False: Given below is the scatter plot of the market value (thousands$) and profit (thousands$) of 50 U.S. companies. Higher market values appear to be associated with higher profits.
Chapter 6 Normal distribution
assignment for May 10th
1、All the major stock market indexes posted gains in 2010. The mean one-year return for stocks in the S&P, a group of 500 very large companies, was 12.8%. The mean one-year return for the NASQAD, a group of 3200 small and medium-sized companies, was 16.9%. Historically, the one-year returns are approximately normally distributed, the standard deviation in the S&P 500 is approximately 20°%, and the standard deviation in the NASDAQ is approximately 30% (1) What is the probability that a stock in the S&P 500 gained value in 2010? (2) What is the probability that a stock in the S&P 500 gained 10% or more in 2010? (3) What is the probability that a stock in the S&P 500 lost 20% or more in 2010? (4) What is the probability that a stock in the S&P 500 lost 40% or more in 2010? (5) Repeat (a) through (d) for a stock in the NASDAQ. (6) Write a short summary on your findings. Be sure to include a discussion of the risks associated with a large standard deviation.
2、A survey in 2005 found that the monthly cell phone bill is $63 for an average user and $77 for a user who uses advanced features. Assuming that monthly cell phone bills follow a normal distribution with the respective means and a standard deviation of $7, find the probability （1）that an average user's cell phone bill is less than $70 per month. （2）that a user of advanced features is able to keep his cellphone bill less than $85 per month （3）that an average user's cell phone bill is above $77 per month （4）What percentage of advanced features users will pay more than the amount that the top 90% of average users pay?
Chapter 7 Sampling and sampling distributions
exercise
1、The amount of time a bank teller spends with each customer has a population mean of 3.1 minutes and standard deviation of 0.4 minute. If you select a random sample of 16 customers, A) What the probability that the mean time spent per customer is at least 3 minutes? B) There is an 85% chance that the sample mean is less than how many minutes? C) What assumption must you in order to solve a) and b)? D) If you select a random sample of 64 customers, there is an 85% chance that the sample mean is less than how many minutes?
中国大学Introduction To Statitics
中国大学Introduction To Statitics是一门介绍统计学基本概念、理论和应用的课程。它是各个专业学生普遍需要修读的一门课程。在这门课程中，学生将学习如何使用数据收集、描述和分析技术来解决实际问题。它包括了描述性统计、概率、假设检验、回归分析、方差分析等内容。
课程设置
中国大学Introduction To Statitics分为两个主要部分：描述性统计和推断统计。在第一部分，学生将学习如何使用图表和数字来描述数据。这些技能将帮助学生更好地理解数据，并为下一部分做好准备。在第二部分，学生将学习如何从样本数据推断总体特征。这将涉及到概率和假设检验的基础知识，以及一些常用的统计方法。
课程目标
中国大学Introduction To Statitics的主要目标是帮助学生掌握以下技能：
- 收集和整理数据的能力
- 数据可视化和描述的能力
- 利用统计方法进行推断和假设检验的能力
- 能够正确解读和解释统计结果的能力
- 能够正确地使用统计软件进行数据分析和报告撰写的能力
教学方法
中国大学Introduction To Statitics采用多种教学方法，包括课堂讲解、案例分析、小组讨论、统计软件操作实践等。学生将会有机会使用常用的统计软件，如SPSS和Excel，来完成数据分析任务。在课程结束时，学生将需要提交一份统计报告，说明他们对所学知识的理解和应用。
考试和评估
中国大学Introduction To Statitics通常由期中考试和期末考试组成。此外，教师还可能安排一些小型作业或小组项目，以帮助学生更好地掌握课程内容。考试内容将覆盖课程中的所有主题，包括描述性统计、概率、假设检验、回归分析、方差分析等。
学生的评估将基于考试成绩、作业和小组项目、统计报告等。除此之外，教师还将考虑学生在课堂上的参与度和表现。
结语
中国大学Introduction To Statitics是一门非常有用和实用的课程。学生将在这门课程中学习到一些基础的统计知识和技能，这将会对他们今后的学习和实践有很大帮助。如果你对数据和分析感兴趣，或者想要进一步提高自己的职业技能，那么这门课程是非常值得一修读的。
