Statistical Decision: - Very often is practice; we are called upon to make decisions about population on the basic of sample information; such decisions are called Statistical Decision. Statistical Hypothesis: - Such assumptions about the population may or may not be true are called Statistical Hypothesis. Null Hypothesis: - If we want to decide whether one assumption or procedure is letter than another. Null Hypothesis is the positive rejection of Hypothesis. It is defined as Ho . Alternative Hypothesis: - The Alternative Hypothesis is the logical opposite to the Null Hypothesis. It is defined as Ha . One Tail Test: - A test of any Statistical Hypothesis where the alternative is one sided such as Ho : μ = μ o or Ho : μ = μ o Ha : μ > μ o or Ha : μ < μ o Is called one Sided Test. Two Tailed Test: A test of any Statistical Hypothesis where the alternative is two sided such as Ho : μ = μ o Ha : μ ≠ μ o Is called Two Sided Test. A test
Statistical analysis often uses probability distributions