Test Statistic Comparing Two Population Means: This Test Statistic Comparing Two Population Means Calculator calculates the test statistic when comparing two population means. This test is used when the varaibl
Depending on the test you run, you may see other statistics that were used to calculate the P value, including the mean difference, t statistic, degrees of freedom, and standard error. The confidence interval and a review of your dataset is given as well on the results page. ...
In a Student’s t-test, the test statistic t is equal to the difference between sample means x̄1 and x̄2, divided by the pooled standard deviation sp times the square root of 1 divided by the first sample size n1 plus 1 divided by the second sample size n2. The pooled stand...
where $\bar{X}$ and $\bar{Y}$ are the corresponding sample means; F-statistic (the critical value for F-Test) is determined by the formula $$F=\frac{s_X^2}{s_Y^2}$$If the variances are equal, then the ratio of the variances is $1$. The larger sample variance should be in...
The mean difference; The standard deviation; and The size of each group. Here you can also find a step by step guide forperforming a T-test on your calculator T-values are a unitless statistic, which makes it challenging to interpret on by itself. ...
Use a one-tailed t-test if you want to test whether this mean (or difference in means) is greater/less than the pre-set value. Compute your T-score value: Formulas for the test statistic in t-tests include the sample size, as well as its mean and standard deviation. The exact formul...
If you are also interested in F-test, check our F-statistic calculator. What is a Z-test? A one sample Z-test is one of the most popular location tests. The null hypothesis is that the population mean value is equal to a given number, μ0μ0: H0: μ=μ0.H0: μ=μ0. We...
M = hypothesized mean difference (null hypothesis) sd= standard deviation ofdvalues. Calculate P-value. It is the probability of detecting a sample statistic to the level of the test statistic. To derive the probability value, we can use a ‘t Distribution Calculator’. ...
Online Student’s t-test calculator What is Welch t-test TheWelch t-testis an adaptation ofStudent’s t-test. It is used to compare the means of two groups of samples when thevariances are different. Welch t-test formula Welch t-statisticis calculated as follow : ...
Test statistic.The test statistic is a z-score (z) defined by the following equation. z = (p1- p2- D) / SE where p1is the proportion from sample 1, p2is the proportion from sample 2, D is the hypothesized difference between population proportions (from the null hypothesis), and SE ...