考华南理工大学容易吗?我现在读高一,语文70+,数学120+,英语30+,物理80＋,化学70+,生物70+.如果努力,

急求2013华南理工大学网络教育统计学作业答案

1.已知某商店1997年销售额比1992年增长64%，1998年销售额比1992年增长86%，问1998年销售额比1997年增长多少？1992至1998年间，平均增长速度是多少？

3. 已知某零件的直径服从正态分布，从该批产品中随机抽取10件，测得平均直径为202.5mm，已知总体标准差σ=2.5mm，试建立该种零件平均直径的置信区间，给定置信度为0.95 。

4. 某企业生产一种新的电子元件,用简单随机重复抽样方法抽取100只作耐用时间试验,测试结果,平均寿命6000小时,标准差300小时,试在95.45%(z=2)概率保证下,估计这种新电子元件平均寿命区间 。

5. 某机械厂日产某种产品8000件，现采用纯随机不重复抽样方式，从中抽取400件进行观察，其中有380件为一级品，试以概率95.45%的可靠程度推断全部产品的一级品率及一级品数量的范围。

6. 根据过去大量资料，某厂生产的产品的使用寿命服从正态分布N（1020，1002）。现从最近生产的一批产品中随机抽取16件，测得样本平均寿命为1080小时。试在0.05的显著性水平下判断这批产品的使用寿命是否有显著提高？

7. 从长期的资料可知，某厂生产的某种电子原件服从均值为200小时，标准差未知的正态分布。通过改变部分生产工艺后，抽得10件做样本，均值为204.8（小时），标准差S=5.789 ，试问电子原件的平均值数据是否有所提高 ? （α=0.05，）

8.调查人员在调查某企业的主要生产线时，被告知性能良好生产稳定，产品合格率可达99%。随机抽查了200件产品，其中195件产品合格，判断厂方的宣称是否可信？（α＝10%）

关于四面体外接球的题（华南理工大学2009自主招生选拔试题）
已知A,B,C,D,是某球面上不共面的四点，且AB=BC=AD=根号2，BD=AC=2,BC垂直于AD，求此球的表面积？ 请问这道题的“通法”是怎样的？

谁有华南理工大学王全迪那本《高等数学》的答案解答过程.不是习题集或者同步练习册,就是那本《高等数学》里面的习题的详细解答过程.

【急】华南理工大学商务统计学求教,
Statistics
Whatis the difference between a sample and a population?
Whatis the difference between a statistic and a parameter
Whatis the difference between a categorical variable and a numerical variable?
Whatis the difference between descriptive statistics and inferential statistics?
Compareand contrast the bar chart for categorical data with the histogram for numericaldata?
Whatis the difference between a time-series plot and a scatter plot?
Whatare the difference among the mean,median and mode?
Whatare the advantages and disadvantages of the mean,median and mode?
Whatis meant by the property of central tendency?
Whatis meant by the property of variation?
Whyis the sample mean an unbiased estimator of the population mean?What is thedifference among sampling methods:simple random sampling,stratified sampling,cluster sampling,systemic sampling?
Whydoes the standard error of the mean decrease as the sample size n increase?
Underwhat circumstances does the sampling distribution of the proportionapproximately follow the normal distribution?
Whenare you able to use the t distribution to develop the confidence intervalestimate for the mean?
Whenare you able to use the z distribution to develop the confidence intervalestimate for the mean?
Whatis the difference between a Type I error and a Type II error?
Whatis the meant by a p-value?
Whatis the six-step critical value approach to hypothesis testing?
Whatis the five-step p- value approach to hypothesis testing?
Whatare the assumptions of ANOVA?
Underwhat conditions should you select the one-way ANOVA F test to examine possibledifferences among the means of c independent populations?
Whenand how should you use multiple comparison procedures for evaluating pairwisecombinations of the group means?
能回答一半的朋友再给50奖励，如果能回答75%的再给100，全部回答出来再给200.

华南理工大学校训用英语怎么翻译？
华工校训：博学慎思，明辨笃行。