The sample is available afterwards for repeat or additional tests.
It enables further use of workpiece.
Provides cost benefits.
Enables comparison to standard and established results.
Enables maintenance of statisctical data for future interpretation.
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advantages of split half reliability
ADVANTAGES Shows relationship between two variables best method to illustrate a non-linear pattern.
It is an assumption to hypothesis testing. I can not comment on the significance of a violation of these assumptions without knowing how the non-random sample was taken.
In statistical hypothesis testing you have a null hypothesis against which you are testing an alternative. The hypothesis concerns one or more characteristics of the distribution. It is easier to illustrate the idea of directional and non-directional hypothesis. In studying the academic abilities of boys and girls the null hypothesis would be that boys and girls are equally able. One directional hypothesis would be that boys are more able. The non-directional alternative would be that there is a gender difference. You have no idea whether boys are more able or girls - only that they are not the same.