The standard deviation is the most common way of measuring variability or “dispersion” in data. The more the data is dispersed, the more measures such as the mean will fluctuate from sample to sample. That means higher variability (higher standard deviations) requires larger sample sizes. But exactly how much do standard deviations—whether large or small—impact
Are customers more satisfied this quarter than last quarter? Do users trust the brand less this year than last year? Did the product changes result in more customers renewing their subscriptions? When UX researchers want to measure attitudes and intentions, they often ask respondents to complete multipoint rating scale items, which are then compared with
For publicly traded companies, it’s not enough to be profitable—you must grow your profits. And growth is often driven by acquiring new customers while retaining existing ones. Much of the allure of the Net Promoter Score is its touted ability to be a leading indicator of growth or a harbinger of receding growth. This is
