Things to consider when collecting sample data
If the sample data we collect is not collected appropriately, the data we gather may be completely useless.
An observational study allows us to measure certain characteristics, but we don’t modify the subjects which are being studied.
In an experiment we apply a treatment, then we observe its effects on a subject.
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Types of Data
Parameter – this is always a numerical measurement which describes a characteristic of a population.
Statistic – this is always a numerical measurement which describes a characteristic of a sample.
Though these both may sound similar, a parameter and statistic are not the same at all except for the fact they are both numerical measurements. Since they sound similar it would prove wise to provide a couple of examples to make sure we understand the difference between the 2.
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A survey concerning reading ebooks vs printed books
Surveys usually help us in improving or making adjustments to products or services. As well as to educate and attempt to explain questions. These may shape different aspects of our life. Surveys allow us to learn the insights and opinions of other people. One survey conducted by USA Today wanted to see if people prefer printed books over electronic ones. There were 281 respondents of which 35% preferred electronic books, while 65% preferred printed books. This survey may seem to suggest that most people rather read printed books than ebooks.
Continue reading An Intro to Statistics