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2 x == 0,it is perfectly clear that the only possible solution is x->0.However, if you havean equation like a a x == 0.things are not so clear,If the a is not equal to zero, then x->0. is again the only answer.If a is in fact equal to zero,then any value of x is a solution, You can see this by 阅读全文
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f[x_]=x^2+1f[x]=x^2+1--------------------------------------f[x_]:=x^2+1***************************The differences of the two is the previous is evaluate firstThat is the RHS is evaluate first then assign it the LHSbut the later assignment is lazy which is say the equation isevaluate when at the spec 阅读全文
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The characteristics of scoresalways pay attention to two important characteristics of the variables:the type of measurement scale involved and wether the scale is continuous or discrete.** The four types of measurement scalesNumbers mean different things in different contexts.* nominal scale, each s 阅读全文
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因果律，the indedpendcy and the dependencyindependency and the %%conditions%%Understanding experiment and correlational studiesAll research generally focuses on demonstrating a relationship.1) what question you want to answer2) choice depends on the specific research design being used ##how many sample. 阅读全文
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REMEMBER: Descriptive procedures results in statistics, which describe sample data and are symbolized using the English alphabet. Inferential procedures are for estimating parameters, which describe a population of scores and are symbolized using the Greek alphabet. 阅读全文
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Descriptive Statistics**Because relationships are never perfectly consistent, 1)The purpose of descriptive statistics is to bring order to this chaos.2)organizing and summarizing sample data so that we can communicate and describe their important characteristics."Important characteristics" 阅读全文
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Identify the X,Y scores the independ and depend variablesScores on the Y variable chage as a function of changes in the X variablewe have involved "test scores as a function of study time""number of eye blinks as function of amount of chocolate consumed"REMEMBER The "givern& 阅读全文
