Which one of the following statements is True?

1. William Sealy Gosset discovered The Central limit Theorem.
2. There is greater spread with sampling means formed from a population that the spread of the population.
3. The lesser the Level of Confidence the harder it is to reject the Null Hypothesis.
4. The lesser the Sample Size the lesser the Margin of Error
5. The lesser the Degrees of Freedom the harder it is to reject The Null Hypothesis when using the T-Distribution.