17.3.3.1 The Pair-Sample T-Test Dialog Box

Supporting Information

To open the Pair-Sample t-Test dialog box:

With a worksheet active, click Statistics: Hypothesis Testing: Pair-Sample t-Test.

Recalculate

Controls recalculation of analysis results

Input Data Form

Raw Data

Enter column with range format. For help with range controls, see: Specifying Your Input Data

Summarized Data

Enter value of mean difference, pooled standard deviation and sample size data for sample(s), in the form as "mean SD N" (space separated numbers)

You can calculate the mean difference by:

$\bar{d}=\frac{1}{N}\sum_{i=1}^N d_i$

and calculate the SD by:

$s_d=\sqrt{\frac{1}{N-1}\sum_{i=1}^N(d_i-\bar{d})}$

The N is sample size. $d_i$ is $x_{1i}-x_{2i},for(i=1,2,...,N)\,\!$ .

Input

Enter the input data.

Test Mean	The hypothetical mean difference to be tested (usually 0).
Null Hypothesis	The null hypothesis to be tested (usually Mean1 - Mean2 = 0).
Alternate Hypothesis	Options: Mean1-Mean2 <> Test Mean Perform a two-tailed paired-sample t-test: Is the mean difference between the two datasets more or less than the hypothetical mean difference? Mean1-Mean2 > Test Mean Perform an upper-tailed paired-sample t-test: Is the mean difference greater than the hypothetical mean difference? Mean1-Mean2 < Test Mean Perform a lower-tailed paired-sample t-test: Is the mean difference less than the hypothetical mean difference?
Significance Level	The significance level of the test.
Confidence Interval(s)	Compute a confidence interval for the mean. For computation details, see Algorithms: Paired Sample t-Test.
Confidence Level(s) in %	Specify space-separated confidence levels, (1- $\sigma$ )%. Available when Confidence Interval(s) is selected.

Actual Power	Compute the power of the test (the probability of rejecting the null hypothesis when it is false).
Significance Level	Only available when Hypothetical Power and/or Actual Power are checked. This is the significance level (alpha value) for power computation.
Hypothetical Power	Compute the power of the test at various sample sizes.
Hypothetical Sample Size(s)	Only available when Hypothetical Power is checked. Specify hypothetical sample size(s) for power computation.

Box Chart	Plot a box chart.
Histogram	Plot a histogram.
Arrange Plots of Same Type in One Graph	Note that for histograms, the layers will be arranged vertically. For box charts, layers will be arranged horizontally.

For help with the range controls, see: Output Results

Results Log Output	Select to output results to the Results Log.
Output Plot Data	Specify a worksheet for output of plotted data (Origin generates tabular data when plots are created).
Output Results	Specify the worksheet for output of test results.