A. population B. data set C. variable D. parameter 相关知识点: 试题来源: 解析 A。本题考查样本的概念。样本是总体的一部分。选项 B“data set”是数据集,样本是从总体中抽取的一部分,不是数据集的一部分。选项 C“variable”是变量,样本不是变量的一部分。选项 D“parameter”是参数,样本不是参数的...
The fingerprint ridge density in radial, ulnar and lower areas and between sexes was compared statistically using t-test. The results indicate that the females tend to have a significantly higher ridge density than males in the three areas analyzed in the study. The fingerprint ridge density in ...
Characterizing the elderly homeless: a 10-year study in Israel Since 1980s there is a noticeable change in the homeless population in Western countries. Some researchers titled the change as the "new" homeless that are... Y Barak,A Cohen - 《Archives of Gerontology & Geriatrics》 被引量: ...
9. Lung function changes associated with chronic exposure to photochemical oxidants; a cohort study among never-... R Detels,JW Sayre,DP Tashkin,... - 《American Review of Respiratory Disease》 被引量: 109发表: 1984年 The UCLA population studies of chronic obstructive respiratory disease. I....
C Casanova,D Natal,Santos F.A.M. - 《Journal of Medical Entomology》 被引量: 63发表: 2009年 Richness and diversity of sand flies (Diptera, Psychodidae) in an Atlantic rainforest reserve in southeastern Brazil. Our objective was to study and evaluate the richness and diversity of Phlebotominae...
The purpose of this study was to estimate the current prevalence and distribution of hypertension and to determine the status of hypertension awareness, treatment, and control in the US adult population. The study used a cross-sectional survey of the civilian, noninstitutionalized population of the ...
The atlantodental interval (ADI) is used in assessing atlantoaxial stability. This measurement may potentially be affected by several features encountered during patient examination. This study examined the influence of 3 features: age, sex, and posture, on the measurement of ADI in a normal popula...
Rural migrants' participation in old-age insurance: a case study of the inter-provincial migrant workers from Sichuan, China C Yong,T Yan,Z Qin-《Chinese Journal of Population,Resources and Environment》 被引量:3发表:2017 Research on the effects of command-and-control and market-oriented policy...
A study on environmentally sensitive grain2size population in inner shelf of the East China Sea. Acta Sedimentologica Sinica , ... 肖尚斌,李安春 - 《沉积学报》 被引量: 255发表: 2005年 Magnetic properties of East China Sea shelf sediments off the Yangtze Estuary: Influence of provenance and ...
Frequencies for five short tandem repeat (STR) systems in a population from North Poland A population study of unrelated individuals from North Poland (gdansk area) was carried out to investigate the allele distributions of the five STR systems... R Pawlowski,A Maciejewska,R Paszkowska,... -...