For a Hypothesis Testing for Two Population Means, how many degrees of

For a Hypothesis Testing for Two Population Means, how many degrees of freedom do you subtract from the total sample size and why?What is the purpose of the symbol D0 in the formula for the test statistic?

For a Hypothesis Testing for Two Population Means, how many degrees of

For a Hypothesis Testing for Two Population Means, how many degrees of freedom do you subtract from the total sample size and why?What is the purpose of the symbol D0 in the formula for the test statistic?

For a Hypothesis Testing for Two Population Means, how many degrees of

For a Hypothesis Testing for Two Population Means, how many degrees of freedom do you subtract from the total sample size and why?What is the purpose of the symbol D0 in the formula for the test statistic?