Z Score Two Sample
Z Score Two Sample. Though it should always be stated, the distinction between use of the population and sample statistics is not made. The two terms may be used interchangeably,.
Because this test is two‐tailed, that figure is doubled to yield a probability of 0.0178 that the population means are.
X = (z)(sd) + mean. It can be used to make a judgement about whether the sample differs significantly on some axis from the population from which it was originally drawn. X = (z)(sd) + mean. X = is the raw score value.