Independent Sample t-Test: Sample Size Calculation Results - Quick Tab

Select the Quick tab of the Independent Sample t-Test: Sample Size Calculation Results dialog box to access options to interactively view the results of sample size calculations and generate plots of required sample size as a function of quantities that affect sample size in practice.

X-Axis Graphing Parameters

The entries in the boxes under X-Axis Graphing Parameters establish the start value, end value, and number of steps on the X-axis for the graphs specified under Sample Size Charts.

Start Es

In the Start Es box, enter the starting value of Es to use in the N vs. Es sample size chart.

End Es

In the End Es box, enter the final value of Es to use in the N vs. Es sample size chart.

Start Alpha

In the Start Alpha box, enter the starting value of Alpha to use in the N vs. Alpha sample size chart.

End Alpha

In the End Alpha box, enter the final value of Alpha to use in the N vs. Alpha sample size chart.

Start Power

In the Start Power box, enter the starting value of the power goal used in the N vs. Power sample size chart.

End Power

In the End Power box, enter the final value of the power goal used in the N vs. Power sample size chart.

No. of Steps.

In the No. of Steps box, enter the number of steps, or intervals, to plot on the X-axis in the charts specified in the Sample Size Charts group box.

Sample Size Charts

Use the buttons under Sample Size Charts to produce charts of required N as a function of power goal, standardized effect size, or Type I error rate. Note that parameters given under X-Axis Graphing Parameters control the range of values plotted on the X-axis and the number of steps plotted.

N vs. Es.

Click the N vs. Es. button to produce a plot of N versus standardized effect size.

N vs. Alpha.

Click the N vs. Alpha button to produce a plot of N vs. Type I error rate.

N vs. Power.

Click the N vs. Power button to produce a plot of N versus power goal.