Question

Write a research hypothesis for which the independent samples t-test will be appropriate. Clearly identify the independent and dependent variables and two potential confounding factors.

Answer 1

The t-test is used to compare the values of the means from two samples and the test wheather it is likely that the sample are from population having different mean values.

when two sample are taken from the same population it is very unlikely that the mean of the sample will be identical. When two samples are taken from two population with very different values.

The t- test the null hypothesis that the the mean of the first treatment equals the mean of second treatment against the alternative mean of first treatment is not equal to the mean of second treatment. Here we accept or reject the null hypothesis under the condition Fcal >= Ftab i.e depend on the p- value.

Independent variable should be measured at the interval or ratio level and dependent variable should be measured such as height, temperature ,salary,etc.