Math 1231 Department Page

To download any file, right click on the hyperlink and select Save Target As...

DATA DESK PROGRAMS

BEFORE YOU CAN ACCESS OR OPEN ANY OF THE FOLLOWING PROGRAMS, YOU MUST HAVE THE ACTIVSTATS CD IN YOUR DISK DRIVE.  I RECOMMEND YOU OPEN DATA DESK (and minimize the program) AND THEN ATTEMPT TO DOWNLOAD THE FILE. 
The following "programs" were written to provide easy access to statistical calculations that Data Desk does not do directly from pull down menus.  Click on the hyperlink to open Z-Area.  A box will appear and will ask you, "What would you like to do with this file?"  Select "Save File As" and put it in your Statistics folder.  To access the program, OPEN Data Desk, select File > Open.

ZArea:  If you have a standardized value (also known as a z-score), you may need to find the area under the curve for a specified interval.  This program contains two boxes.  Follow these instructions for BOTH boxes.  Click on the HyperView box (the "play" button) and select "Set Value."  Depending on the area you need to find, choose the lower limit.   Repeat this process for the upper limit.  The area will be displayed in a box to the right.

Inverse Normal:  This program does the reverse of the ZArea program.  If you are given the area under the curve and need to know the data value that divides the curve, use "Inverse Normal."  The program will prompt you for the "p" value.  The program ALWAYS calculates the area as it accumulates from the left (starting at negative infinity) up to the value you specify.  Therefore, you MUST use the "p" that corresponds to the area on the LEFT side of the curve.  Select the mean and standard deviation.  An easy way to verify your answer is to place your result on the normal curve and make sure it is consistent with the question asked.

1-Proportion Confidence Interval: This program will calculate a confidence interval for estimating one population proportion.   The program contains three boxes.  In the first box, click on the HyperView box (the "play" button) and select "Set Value."  Type in the number of successes.  Repeat this process for sample size and confidence level.   The interval will be displayed to the right.

1-Proportion Hypothesis Test:  This program calculates the test statistic and p-value for a hypothesis test of one population proportion.  Click on the HyperView box, select "Set Value,"  and type in the number of successes, sample size, and the null hypothesis value to test.  The computer displays p-hat (the estimated proportion obtained from the sample = # of successes/n), the test statistic (shown as z-statistic), and a box for p-values.  Look at the alternative (that you wrote based on the information requested in the specific problem) and determine whether you need the p-value corresponding to Ha:  p >    or Ha:  p < .

2-Proportion Confidence Interval:  This program will calculate a confidence interval for estimating the difference between two population proportions.   The program contains three boxes.  In the first box, click on the HyperView box (the "play" button) and select "Set Value."  Type in the number of successes.  Repeat this process for sample size and confidence level.   The interval will be displayed to the right.

2-Proportion Hypothesis Test:  This program calculates the test statistic and p-value for a hypothesis test of the difference between two proportions.  Click on the HyperView box, select "Set Value,"  and type in the number of successes, sample size, and the null hypothesis value to test.  The computer displays p-hat (the estimated proportion obtained from the sample = # of successes/n), the test statistic (shown as z-statistic), and two different boxes for p-values.  Only ONE of these two boxes will be appropriate.  Look at the alternative (that you wrote based on the information requested in the specific problem) and determine whether you need the p-value corresponding to Ha:  p >    or Ha:  p <