概率论常见的概率分布，使用Python中第三方库scipy中的stats模块比较多，通过from scipy import stats实现。
概率论常见的概率分布，使用Python中第三方库scipy中的stats模块比较多，通过from scipy import stats实现。
参考答案和解析
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相关考题：
已知在脚本文件N.py中有函数调用“B.c()”,其中B是A包中的模块,则import语句的正确写法是()。 A.import A.B.cB.import A.BC.from A import BD.from A.B import c
Youexecutedthefollowingcommands：SQLALTERSESSIONSETOPTIMIZER_USE_PENDING_STATISTICS=false；SQLEXECUTEDBMS_STATS.SET_TABLE_PREFS（’SH’，’CUSTOMERS’，’PUBLISH’，’false’）；SQLEXECUTEDBMS_STATS.GATHER_TABLE_STATS（’SH’，’CUSTOMERS’）；WhichstatementiscorrectregardingtheabovestatisticscollectionontheSH.CUSTOMERStableintheabovesession？（）A.Thestatisticsarestoredinthependingstatisticstableinthedatadictionary.B.Thestatisticsaretreatedasthecurrentstatisticsbytheoptimizerforallsessions.C.Thestatisticsaretreatedasthecurrentstatisticsbytheoptimizerforthecurrentsessionsonly.D.Thestatisticsaretemporaryandusedbytheoptimizerforallsessionsuntilthissessionterminates.
Youhavearange－partitionedtableinyourdatabase.EXECUTEDBMS_STATS.GATHER_TABLE_STATS（’SH’，’SALES’，GRANULARITY=’GLOBAL’）；Youneedstatisticstobecollectedmorequickly.Whatcanyoudotoachievethis？（）
Examine this command:SQL exec DBMS_STATS.SET_TABLE_PREFS (‘SH’, ‘CUSTOMERS’, ‘PUBLISH’, ‘false’);Which three statements are true about the effect of this command?() A. Statistics collection is not done for the CUSTOMERS table when schema stats are gathered.B. Statistics collection is not done for the CUSTOMERS table when database stats are gathered.C. Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.D. Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics.E. Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.
ROMN是对(1)标准的重要补充，用到RMON MIB有关以太网统计组中的变量ether StAts Drop Eventsether StAts CRC Align Errors和etherstAtus UnDersizePKts的是(2)。在网络管理标准中，通常把(3)层以上的协议都称为应用层协议。RMON2监视器的网络接口是(4)。计算机中的信息只能由授权访问权限的用户读取，这是网络安全的(5)。A．SMTPB．SNMPC．UDPD．ICMP
Considerthefollowingstatement：SQLEXECUTEDBMS_STATS.GATHER_SHEMA_STATS（-2ownname=‘OE’，-3estimate_percent=DBMS_STATS.AUTO_SAMPLE_SIZE，-4methodopt=‘forallcolumnssizeAUTO’）；Whatistheeffectof‘forallcolumnssizeAUTO’oftheMETHOD_OPToption？（）A.TheOracleservercreatesanewhistogrambasedonexistinghistogramdefinitionsforalltable,column,andindexstatisticsfortheOEschema.B.TheOracleservercreatesahistogrambasedondatadistributionregardlessofhowtheapplicationusesthecolumn/sforalltable,column,andindexstatisticsfortheOEschema.C.TheOracleservercreatesahistogrambasedondataandapplicationusageofthecolumn/sforalltable,column,andindexstatisticsfortheOEschema.D.TheOracleservercreatesahistogrambasedonapplicationusage,regardlessofdatadistribution,foralltable,column,andindexstatisticsfortheOEschema.
以下哪些行为可以使得程序同时兼容Python2和Python3？（）A、使用2to3工具进行转换B、使用six库C、使用sys.version判断版本进行区分D、import时捕获ImportError异常尝试使用另一个版本的路径引入
关于引入模块的方式，错误的是（）。A、import mathB、from fib import fibonacciC、from math import *D、from * importfib
SQL Server数据库提供的错误信息如何查看？（）A、查看系统视图sys.database_filesB、查看系统视图sys.messagesC、查看系统视图sys.errorD、查看系统视图sys.stats
You executed the following commands： SQL ALTER SESSION SET OPTIMIZER_USE_PENDING_STATISTICS = false； SQL EXECUTE DBMS_STATS.SET_TABLE_PREFS（’SH’， ’CUSTOMERS’， ’PUBLISH’，’false’）； SQL EXECUTE DBMS_STATS.GATHER_TABLE_STATS（’SH’， ’CUSTOMERS’）； Which statement is correct regarding the above statistics collection on the SH.CUSTOMERS table in the above session？（）A、 The statistics are stored in the pending statistics table in the data dictionary.B、 The statistics are treated as the current statistics by the optimizer for all sessions.C、 The statistics are treated as the current statistics by the optimizer for the current sessions only.D、 The statistics are temporary and used by the optimizer for all sessions until this session terminates.
单选题You want to capture column group usage and gather extended statistics for better cardinality estimates for the CUSTOMERS table in the SH schema. Examine the following steps: 1. Issue the SELECT DBMS_STATS.CREATE_EXTENDED_STATS (‘SH’, ‘CUSTOMERS’) FROM dual statement. 2. Execute the DBMS_STATS.SEED_COL_USAGE (null, ‘SH’, 500) procedure. 3. Execute the required queries on the CUSTOMERS table. 4. Issue the SELECT DBMS_STATS.REPORT_COL_USAGE (‘SH’, ‘CUSTOMERS’) FROM dual statement. Identify the correct sequence of steps.（）A3，2，1，4B2，3，4，1C4，1，3，2D3，2，4，1
多选题Examine this command: SQL exec DBMS_STATS.SET_TABLE_PREFS (‘SH’, ‘CUSTOMERS’, ‘PUBLISH’, ‘false’); Which three statements are true about the effect of this command?（）AStatistics collection is not done for the CUSTOMERS table when schema stats are gathered.BStatistics collection is not done for the CUSTOMERS table when database stats are gathered.CAny existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.DStatistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics.EStatistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.
单选题python中，导入模块使用的关键字是（）。AimportBgotoCelseDif