Although several companies developed tablets throughout the 1990s and 2000s, the tablet computer only became mainstream after Apple introduced the iPad in 2010. Later that year, Samsung released the Galaxy Tab, the first tablet to run Google's Android operating system. Like the iPad, Android tablets can run millions of different apps, making tablets a portable option for both work and play.
A null hypothesis is one that is assumed to be true unless it has been contradicted. It is used to compare to another hypothesis. The experimental hypothesis is what you are observing, and you expect it to differ from the control. erm i know that a null hypothesis is when nothing happens at all i think.
DEFINITION of 'Null Hypothesis'. A type of hypothesis used in statistics that proposes that no statistical significance exists in a set of given observations. The null hypothesis attempts to show that no variation exists between variables, or that a single variable is no different than zero. It is presumed to be true until statistical evidence nullifies it for an alternative hypothesis. Next Up.