test for the equality of variances (thanks to the Levene’s test) depending on whether the variances were equal or unequal, the appropriate test was applied: the Welch test if the variances were unequal and the Student’s t-test in the case the variance...
The family turns to see -- A DRUNK MAN teetering toward the semi-basement window. Their faces slowly fill with dread. CHUNG-SOOK How many times did I tell you? We need to put up a “No Urinating” sign. KI-TEK It’ll make them want to do it even more. It’s psychology. ...
Before we dive into how to do a t-test in Excel, let’s take a step back and explore what a t-test is. At its core, a t-test is a statistical method used to compare two groups of data to see if they are significantly different from each other. Specifically, it helps you answer...
A/B testing has many benefits to a marketing team, depending on what you decide to test. For example, there is a limitless list of items you can test to determine the overall impact on your bottom line. But you shouldn’t sleep on using A/...
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2. If your t-test is one-tailed, you need to say so.3. There are two ways to report p values. The first way is to cite the alpha value, as in the second of the single sample t-test examples above. The second way, very much the preferred way in the age of computer aided ...
Describes how to do a paired t-test in R/Rstudio. You will learn the calculation, visualization, effect size measure using the Cohen's d, interpretation and reporting.
Determine the sample sizeand timeframe for yoursplit tests. Depending on your A/B testing tool, you can set the sample size and test duration. If you need help deciding what to choose and there's no analyst to ask, try thissample size calculator. ...
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