## Which condition must be met to perform the two-sample t test?

Question: Which condition must be met to perform the two-sample t test? There can be no skewness in either of the distributions. The two random samples must be selected from two distinct populations. The two random samples must be selected from the same population.

### When should you use a two-sample t test?

The two-sample t-test (Snedecor and Cochran, 1989) is used to determine if two population means are equal. A common application is to test if a new process or treatment is superior to a current process or treatment. There are several variations on this test. The data may either be paired or not paired.

What are the 2 types of two-sample t tests?

Calculating the Statistic / Test Types An Independent Samples t-test compares the means for two groups. A Paired sample t-test compares means from the same group at different times (say, one year apart). A One sample t-test tests the mean of a single group against a known mean.

What is a two-sample procedure?

A two-sample procedure is given for selecting the population with the largest mean fromk normal populations with known variances. Thek populations are screened through the first sample for possible elimination of those populations which have considerably smaller means.

## What conditions must be met before using t-test?

The common assumptions made when doing a t-test include those regarding the scale of measurement, random sampling, normality of data distribution, adequacy of sample size, and equality of variance in standard deviation.

### What is the difference between one sample and two-sample t-test?

As we saw above, a 1-sample t-test compares one sample mean to a null hypothesis value. A paired t-test simply calculates the difference between paired observations (e.g., before and after) and then performs a 1-sample t-test on the differences.

What is the purpose of a two-sample t-test?

The two-sample t-test (also known as the independent samples t-test) is a method used to test whether the unknown population means of two groups are equal or not.

What is two-sample z test used for?

The Two-Sample Z-test is used to compare the means of two samples to see if it is feasible that they come from the same population. The null hypothesis is: the population means are equal.

## What are the assumptions of a two sample t-test?

Two-sample t-test assumptions Data in each group must be obtained via a random sample from the population. Data in each group are normally distributed. Data values are continuous. The variances for the two independent groups are equal.

### What is a 2 sample t-test used for?

Which condition must be met to perform the two-sample t test? Question: Which condition must be met to perform the two-sample t test? There can be no skewness in either of the distributions. The two random samples must be selected from two distinct populations. The two random samples must be selected from the same population.…