This is the ghost example we will use in this chapter null to illustrate the heater test.

Likewise for several other subjects.

To do this, select the manual first variable, then hold down "Control" and select the second, then move them over to the "Paired Variables" box with the blue arrow: Then hit "OK." You'll patch get the following tables in the Output Window: The first table provides basic.

According to a widespread manual convention, we shouldn't conclude that there is a relationship, only that we reject the null hypothesis (see.Of crack interest in our comparison are the two means.Even without a built-in option, is is so easy to set up a spreadsheet to do a paired t test that it may not be parameter worth the expense owners and effort to buy and learn a dedicated statistics software program, unless more complicated statistics are needed.In this case, we would reject the null hypothesis that they are the same and accept the alternative.The sixth column, "t is the t-score.You can use a paired samples t-test steel to compare the scores on the two variables.In the example below (based on false data for illustration only the p value is very low.Error of visual the Mean" are calculated on the average mean in the first column.To begin with, select "Analyze" - "Compare Means" - "Paired-Samples T Test The "Paired-Samples T Test" window will open: To select the variables to compare, you media have to actually select two variables at the same time.Criteria, the number of points in each data set must gallon be the same, and they must be organized in pairs, in which there is a definite relationship between each pair of data points.The first column is labeled the "Mean" and it is the average difference between the two variable means.Even if data are related in pairs, sometimes the paired t is still inappropriate.The variables being averaged must also be numerical and adequately normal.The second table, a correlation table, is discussed in the chapter on correlation, so it will not be discussed here.If your data is not normally distributed, visual or there are outliers, you may be better using the.Columns four and five are lower and upper confidence intervals for the difference.In the sample data set of genetic counselors, there are two interval variables that have the same unit of measure - a 10 point scale.From this we might reject the null hypothesis in favour of the alternative hypothesis - namely, that there is a difference.The p value tells you how likely the difference observed would occur if sampling from a population sunline in which there is no actual difference.For more information on confidence intervals, see the chapter on confidence intervals. We might go so far as to reject the null hypothesis in favour of the alternative hypothesis.

The value of the paired t test is best demonstrated in an example.