ztesting
Z-testing, also known as a z-test, is a statistical method used to determine whether there is a significant difference between the means of two populations. It is particularly useful when the sample size is large (typically n > 30) and the population standard deviation is known. The z-test is based on the standard normal distribution, which allows for the calculation of probabilities and the determination of whether the observed difference between sample means is statistically significant.
The z-test formula is derived from the standard normal distribution and is given by:
z = (x̄1 - x̄2) / √(σ1^2/n1 + σ2^2/n2)
where x̄1 and x̄2 are the sample means, σ1 and σ2 are the population standard deviations, and
Z-testing is commonly used in various fields, including quality control, market research, and scientific experiments. It