Give me the right answer and help me understand what its trying to say

One-sample t-test Z ( X3) 2X3 1. Estimated Population Variance Sy N N-1 Estimated Population Standard Deviation Sx = VSx These get to the SX SX same answer; one 2. Estimated Standard Error of The Mean Sx or Sy = VN uses the variance VN and the other the standard deviation X- u 3. One Sample T-Test tobt = Degrees of Freedom df = N-1 SX Confidence Interval For u: (Sx)(-tcrit) + X S u S (Sx)(+tcrit) + X (use the two Tailed of = 1) Two independent samples t-test 1. Estimated population variance for both, sample 1 and sample 2. Identify with a 1 and 2 to distinguish them. EX2_ (EX) 2 Estimated Population Variance Sy = N N-1