Question

Describe a two-sample t-test, the sample cases, the variable, how the variable is measured, the statistics calculated from the variable, the t-test and the reason you want to use it. Write complete sentences

Answer 1

Two sample T test.

T test genarally use for mean comparisons..

We use one sample mean test ..ex. mu=!50

or two means are comparing also that called two sample mean..

mu1<mu2 or mu1>mu2 or mu1=!mu2

Two sample you need two sample data.. you compare means of sample 1 and sample 2.

If you know variance of the data then you can use z test but you don’t population variance . So you calculate sample variance. And use t test .Means variance is unknown then you use t test...

but observation should be less then 30.

N<30 you use t statistics for mean comparisons..

generally t test use for pharma industry if you analysis some drug but you don’t have more observation then you use t test for checking your drug significant or not...

Teo tailed example:

suplose we check male height mean and female height mean is same,greater or less then

Thanks