Onesample t test
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Key Questions

tdistribution is also known as student's tdistribution .....
this is a probability distribution that is used to estimate the population parameter when the given sample space is small or when the variance is unknown .
this type of distribution has three types of properties and they are:

mean distribution is equal to zero

variance is equal to v/ (v2) where the v is the degrees of freedom and v is always less than 2
 the variance is always greater than one. with infinite degrees of freedom the tdistribution is same as standard normal distribution.


Conditions for conducting onesample ttest for mean:
1.) Parent population from which the sample is drawn should be normal.
2.) The sample observations are independent. i.e the given sample is random.
3.) The ''population'' standard deviation is unknown. 
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