3-尤进红定量分析期末考试

1、定量分析期末考龙Themeanofthedataistheaveragevalueofthedata.However, for this series of data, there is an extremely large number, that is, 280. That makes the mean value inappropriate to measure the center of the data.The mode is the value that occurs with greatest frequency. The series of data has seven dif

2、ferent values. Each number appears once, so using mode as the measure of center is clearly The median is another measure of central location. The median is the value in the middle when the data are arranged in ascending order (smallest value to largest value). With an odd number of observations, the

3、 median is the middle value. An even number of observations has no single middle value.So I choose median as the measure of center for this series of , let the data be arranged in ascending order. That is, 280. The median of the data ThemeanofthedataisThesamplestandarddeviationisThenumberofstudentst

4、hatgotmarksgreater orequalto8513. The proportion that the marks is greater or equal to 85 is Themeanof isTheStandardDeviationof p =0.26 1 -Thesamplingdistributionof p isanormaldistribution-pE(-)=0.26and =0.03102,thatis p N(0.26,p Z= 5.1,soLet the BMI of arrested abusers who were 36 years of age or o

5、lder be X1.The hypothesis is H0: the mean BMI of arrested abusers who were 36 years of age or older is higheror equal to that for all arrested abusers, that is, X123.8Ha:the mean BMI of arrested abusers who were 36 years of ageorolderislowerthanthatforallarrestedabusers,thatX13.59 and the P-value is

6、 clearly lower than 0.05,The t statistic for X2 is 2.3750, greater than upper side critical value 2.145. The relationship between Salary and Sex isThe t statistic for X3 is 2.2163, greater than upper side critical value 2.145. The relationship between Salary and Class of degree fraduates is signicant.so the estimated regression equation developed above a good Sarah isa female teacherwith X1 = 108, X3 = 4, 1729, the me