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There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of governmental units (state and statistics come from the same Latin root, status) and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance. The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating, .ordering, and the taking of censuses - all of which led to modern descriptive statistics. From the influence of the father came modern inferential statistics, which is based squarely on theories of probability. Descriptive statistics involves tabulating, depicting, and describing collections of datA、These data may be either quantitative, such as measures of height, intelligence, or grade level variables, that are characterized by an underlying continuum or the data may represent qualitative variable, such as sex, college major, or personality type. Large masses of data must generally undergo a process of summarization or reduction before they are comprehensible.Descriptive statistics is tool for describing or summarizing or reducing to comprehensible form the properties of an otherwise unwieldy mass of datA、 Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human minD、 This general class of problems characteristically involves attempts to make predictions using a sample of observations. For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient to question each child; the proportion for the entire district could be estimated fairly accurately from a sample of as few as 100 children. Thus, the purpose of inferential statistics is to predict or estimate characteristics of a population from knowledge of the characteristics of only a sample of the population. |
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Most injures can be prevented, provided a parent goes about it the right way. Mr. Grant was a skilled and capable surgeon. His wife--intelligent, charming and a qualified nurse--had suggested they see me about their 16-month-old son, Neville. Mrs. Grant spoke first. "We’re both professional people, and I guess we’re supposed to know more than most people. It hurts us to admit our little Neville is such a problem." "He’s all over the house, climbing, handling things he’s not supposed to be touching," Mr. Grant interrupted, "and we’re afraid he’ll badly injure himself and it’ll be our fault." "Does he have some understanding of the word ’ no’," I asked… "That’s just it, we can’t be sure if he has or not. Sometimes he seems to understand, but at other times he just doesn’t seem to mind when we say ’no’," the father replieD、 "Teaching a child the meaning of the word ’no’ can be crucial in preventing accidents. Unless your Neville can understand the true meaning of ’no’--and only you two can teach it to him at this stage--there’s bound to be trouble," I stated emphatically. Children between the age of one and two often injure themselves, sometimes quite seriously, if they’ve not been properly trained to respond to the word ’no’. It’s only natural that our child, having only recently learned to move about, should want to explore and find out about this big, beautiful world around him. His sense of curiosity gets the better of him. To begin with, the fewer "no’s" you tell your child, the better off things it will be. This can be done by thoughtfully removing from the room all those forbidden objects you suspect he’ll reach for. You must be absolutely consistent.Be quick, alert, and fast-acting in preventing him from reaching for a forbidden object. Draw his attention, towards something else he can play with. |
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