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Statistics ch1
by ‹ Ruba
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Statistics ch1

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Is the science of conducting studies to :

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Organize

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Summarize

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Analyze

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Draw conclusion from data

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Collect

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Type of statistics

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1- Descriptive statistics

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2- inferential statistics

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Data : the values that the variables can assume.

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Data set : A collection of data values

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Data value \ datum : each value in the data set.

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Sample ; a group of subjects selected from a population .

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The four basic methods of sampling are

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Error

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درست اطوال ٥٠٠ شخص

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Population; consists of all subjects that are being studied.

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طلاب الجامعة / متوسط العدد

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Variables : a characteristic or attribute that can asuume different vaules.

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1- qualitative: variables that have distinct categories according to some characteristics or attribute.

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2- quantitative variables

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Level Measurement of the data :

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Type of statistical studies

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Observational study

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Experimental study

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Uses and misuses of statistics

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Suspect sample

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Ambiguous average

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Changing the subject

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Detached statistics

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Implied connections

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Misleading graph

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Faulty survey questions

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