显著性水平

According to the basic principle of hypothesis testing,three kinds of one sided hypothesis testing with the same reject region at the same significant level α are given and how to choose primary hypothesis and alternative hypothesis at the actual application and correlation are also pointed out.

根据假设检验的基本原理，给出 3种单侧假设检验在相同的显著性水平下具有相同的拒绝域，并指出在实际应用中如何选择原假设和备择假设及其相互关系。

In this paper, we developed an alternative test to cope with the trade-off between safety and efficacy.

在Ⅱ期临床试验阶段，由于样本量较小的缘故不大可能同时控制反应率和毒性的第一类错误，我们可以根据实际临床需要将这两个第一类错误分别确定在不同的显著性水平。

There is also notable difference in the score of UCLA Loneliness Scale and Interaction Anxiousness Scale between the two groups.

两组被试在UCLA孤独量表与社交焦虑量表上得分的差异也达到显著性水平。

This value is prescribed only vaguely by many authors with no reference to any significance level. This paper will give out an asymptotic critical value in a fixed significance level and an asymptotic p-value for testing by means of extreme value theory in order to detect outliers in AR model.

本文运用极值理论给出诊断AR模型异常点选取临界值的分布近似方法，这种方法选取的临界值可保证控制在一定的显著性水平下，而且还可以计算出检验的渐近p值，比一般仿真选取的临界值更科学合理。

In this paper, the statistical characteristics of one plane and one helicopter's RCS dynamic measurement data are studied by using the χ^2 distributing, log-normal distribution and Rayleigh distributing model, along with the Kolmogorov fit test to goodness, the fitting results in some notableness level are acquired by using the three models for different aspect angles for two targets, and the degree of freedom distribution of χ^2 model in all aspect angles is obtained for two targets' RCS data.

文中以某歼击机和直升机为对象，应用χ^2分布、对数正态分布和瑞利分布模型，以及Kolmogorov拟合优度检验方法，研究其RCS动态测量数据的统计分布特征，得到了在一定显著性水平下，两种目标在不同视向角下对三种模型的拟合效果，同时得到应用χ^2分布拟合时模型半自由度随视向角的分布情况。

Using a large sample independent Z test, It can be inferred that the possibility of the averaged scores overall of two key schools science students which falling into the confidence intervals of (89.78, 91.50) and ( 82.79, 87.63) were 95%, significantly at a higher level.

运用独立大样本Z检验，推断两所重点中学理科学生成绩总体均值依次落入以下置信区间(89.78，91.50)，(82.79，87.63)的可能性为95%，达到显著性水平α=0.05。

Results］ In the one-way analysis, the risk factors of breast cancer are history of benign breast diseases, high body mass index, early age at menarche, family history of carcinoma, late age at primiparity, high frequency of abortion, a large age at last parturition, and swell or pain in breast during menstruating.

结果］ 单因素分析，达到统计学显著性水平的危险因素有乳腺良性疾病史、BMI指数高、初潮年龄早、肿瘤家族史、初产年龄大、流产次数多、未产年龄大和行经时乳房涨痛。哺乳和饮用井水是保护因素。

Results］ In the one-way analysis, the risk factors of breastcancer are history of benign breast diseases, high body mass index, early age at menarche,family history of carcinoma, late age at primiparity, high frequency of abortion, a largeage at last parturition, and swell or pain in breast during menstruating.

结果］单因素分析，达到统计学显著性水平的危险因素有乳腺良性疾病史、BMI指数高、初潮年龄早、肿瘤家族史、初产年龄大、流产次数多、未产年龄大和行经时乳房涨痛。哺乳和饮用井水是保护因素。

Using a variety of diversity indexes to study the diversity of grasshopper in different habitat region, the results showed that diversity indexof 5 kinds of habitats has the order: crude redeposit broad-leaf weed-tree forest＞farmland region＞artificial larch tree＞lakefront wetland＞cutting blank.

采用各种多样性指数对不同生境蝗虫多样性进行了研究，结果显示，Shannon-wiener多样性指数的排序情况为天然次生阔叶杂木林＞农田＞人工林＞湖边湿地＞采伐迹地，Pielou均匀度指数变化和H′变化较为一致，相关系数为0.918，达到了显著性水平。

There was a significantly negative correlation between the content of polyphenol and the activity of PPO, the correlation coeffieicient of wraped pear was higher than that of non-wraped pear, that of sarcocarp was greater than that of core.

经统计分析，果实酚类物质含量与PPO活性负相关性达到极显著性水平（p＜0.01），其相关程度是套袋梨大于不套袋梨，果肉大于果心。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。