统计学试卷(国际学院-英文)

江西财经大学试卷论文代码：上课时间：48课程名称：将统计应用于：1.单一选择(1 point per question，10 points total)1.which option below is a continuous indicator？(c)a，Number of employees B，Number of machines C，Gross industrial output value D，Number of workshops2.which ratio below represents the largest variance？(b)。a、0.7 B、0.5 C、0.1 D、0.43.assuming a population with normal distribution。in order to estimate the interval of its mean value，which statistic should be used if only a small sample is available？(c)a，Normal statistic B，2 statistic C，t statistic D，f statistics4.if all observed data values fall on the regression line，then the correlation between these two variables is(c)。a、1 B、-1 C、1 or -1 D、05.sampling standard variance(eg .)shows the(c)between sample indicator and population indicatora，Real errorb，Absolute value of real errorc，Average level of errord，Possible level of error6.if web know the of a linear regression is 0.64，then the resdual sum of squares occupies a proportion of(a)in the total sum of squares。a、0.36 B、0.8 C、0.6 D、0.27.assuming is twistance as much as，and is 1.2 times as much as。then the correlation coefficient should be(d)。a，Not calculable B，0.6 C，d，8.estimating the percentage of germination based on a limited number of germination tests is a method of(b)a、Comprehensive analysisb，Inductive concludingc，Mass analysisd，Statistical grouping9.if web try to transforma general index into weighted arithmetical mean form，the weight should be (B)a，The numerator of the general indexb，the denominator of the general indexc，A fixed weightd，Based on the particular problem10.the correlation coefficient r and the regression coefficient b should be(a)a，Of the same sign B，Of the different sign C，Mostly of the same sign D，Sometimes of the different sign2.true or false (1 point per question，mark t behind the true statements， f behind the false statements . 10 points tots1.in real statistical applications，when calculating price index，quantity indicators of the base period are often used as the metric unifation(f)2.just like correlation analysis，regression analysis analyzes two random variables。(f)3.indicator(general index)calculated based on the unit(element)variables re presenting a population numerical property is a raras4.when the volume of sample increases，if the estimated value approachs the real variable being estimated，we can say this estimated value has(t)5.the relationships between variables can be summariazed into correlationship and functional relationship。(t)6.population index has two calculation method : general index and mean value index。(t)7.if the hypothesis being tested is h0:0，a left one-side test should be used。(t)8.both the regression coefficient b and the correlation coefficient r can describe the closesness of the relationship between two phennomena .(f)9.if the correlation coefficient is 0，then the two variables has no correlation。(f)。10.if the sales volume of items increased by 5%，mean nwhile the price decreated by 5%，the sales value stays the same。(f)3.question and answers (5点2=10点)1.describe briefly the principles for making general index。2.describe briefly the central limit theorem。4.计算(45点)1.a company is examing a shipment of packaged goods that is about to be sent。100 packages are sampled . on average，There are 99 items in every package with the standard variance of 5 .try estimate the interval of the mean number of items in every package with the c Onfiddence level of 95.45%。if the allowed error margin is reduced to a half of before，while all other variables stay unchanged，how many packages need to be sampled？if web know the passrate of the packages in the sample is 90% then estimate the interval for the pass rate of the whole shipment with the same configdd(16点)。2.a company exports packaged tea abroad . the package weight is specified to be 500g。bases on past experience，Weknow the standard deviation of the package weight is 5g。now the company is examping a shipment before it s shiped . 100 packages are sampled，And the average weight is 502g。if the package weights are normal distributed，then does this shipment fall within the specification(significience level is 0.05)？elabora te what kind of mistake can be made during this judging process。(14点)。3.the exporting price and volume of 3 products are listed below :产品Export volumeExport Price(美元)基本期间报告期间基本期间报告期间a(材质)15001800240200b(米)210020008690c(色调)32003800140165question : using the index system，analyze the impacts that the changes of export volume and price have caused on the export value，With be(15点)。5.案例研究(25点)a company makes a certain kind of goods。the data for product volume and unit cost as listed below :月123456体积(piece)234345单位成本(10，000元)737271736968Question:(1)make a scatter diagram to find out the direction and type of correlation between the two variables。(2)calcul