摘要: The validity of the result for a linear regression model requires the following assumptions:The exist[阅读全文]
摘要: Simple linear regression is a statistical technique that attempts to explore and model the relationsh[阅读全文]
摘要: Nonparametric methods were most suitable when researchers have little knowledge about the population[阅读全文]
摘要: For 2x2 table ,if expected frequency of each cell is more than 5,and total numbers n>40,we should[阅读全文]
摘要: The chi-square test is used in two similar but distinct circumstances:(1)how closely an observed dist[阅读全文]
摘要: ANOVA is commonly used to compare more than two means among different groups,the principle is to divi[阅读全文]
摘要: T-test is used to access whether the means of two groups are statistically different in a continuous[阅读全文]
摘要: Type 1 error :when Ho is true ,a hypothesis test conclusion rejects Ho and accepets H1 due to samplin[阅读全文]
摘要: Step one :to establish the null hypothesis Ho,and the alternative hypothesis H1Step two :set up a sig[阅读全文]
摘要: Hypothesis test is based on the think of reduction to absurdity.That means a small probability event[阅读全文]
摘要: Parameter estimation involves the use of sample statistic to estimate population parameter.It consist[阅读全文]
摘要: Sampling error arises when a population parameter is estimated by just one sample from the population[阅读全文]
摘要: Normal distribution is a fundamental and important distribution of a continuous random variable,it is[阅读全文]
摘要: Poisson distribution is a common type of discrete random variable distribution.It is mainly used to d[阅读全文]
摘要: Binomal distribution is a basic distribution of a discrete random variable,if an observation has two[阅读全文]
摘要: Standardization can eliminate the influence of population composition in different samples,making the[阅读全文]
摘要: measurementsapplicationscentral tendencyarithmetic meanSymmetrical distribution, especi[阅读全文]
摘要: The statistical measures of central tendency include arithmetic mean,geometric mean,median. The[阅读全文]
摘要: Randomization refers to random sampling,random allocation and random test sequence.[阅读全文]
