Onesample t test
Key Questions

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. 
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.
