data were collected on 100 students regarding their class and major. the data are summarized in the following contingency table: what is the probability of randomly selecting a sophomore or an undeclared student?
聚合函数中,用于求出某个字段平均值的函数是________函数。
the purpose of a contingency table is to summarize:
in a positively skewed distribution, which measure of central tendency is the largest?
下面选项中,属于mysql用于放置日志文件以及数据库的目录是()
【论述题】《红与黑》中于连形象分析。
select语句的过滤条件既可以放在where子句中,也可以放在from子句中。
the difference between a permutation and a combination is:
下列要素中,属于案例研究设计的基本要素是
在删除数据表的时,如果表与表之间存在关系,那么可能导致删除失败。()
a bank asks customers to evaluate the quality of drive-through service as good, average, or poor. which level of measurement is used to measure service quality?