Statdisk Instructions for Chapter 10 Technology Exercise

M&M Colors (Question 1)

Finding the claimed proportions

  1. Go to the M&M website at http://www.mms.com/
  2. Click on About M&Ms
  3. Choose Products
  4. Choose Peanut M&Ms
  5. The claimed percentages are given, but the web page is not accessible, so if you're color blind, have your partner look at the page and send a note to M&M Mars letting them know that their page isn't accessible.

Finding the test statistic, p-value, critical value (parts d, e, and f)

  1. Label the first two columns in as Observed and Claimed
  2. In the Observed column, enter the observed frequencies from Classroom Activity 7. Be sure you use the data for your section.
  3. In the Claimed column, enter the percents as claimed from M&Ms. You must enter them as proportions (decimals).
  4. Chose Analysis / Multinomial Experiment / Unequal Expected Frequencies
    1. The expected frequencies are entered as proportions
    2. The observed column is column 1
    3. The expected column is column 2
    4. Click Evaluate

The expected frequencies are not given to you like they are with Minitab, you'll need to find them by hand.

Amtrak Delays (Question 2)

Gathering the Data

Amtrak keeps data available for the last five (5) days only. Since you need at least six days of information, you will need to collect information on more than one date. Do NOT wait until this is due to start it.

  1. Visit the Amtrak website at http://www.amtrak.com/
  2. The center portion of the screen is split into two parts, Fare Finder and Train Status. Go to the Train Status section.
    1. Leave the Departs box empty
    2. Put CHI in the Arrives box
    3. Put 300 in the optional Train No box.
    4. Click Next
  3. Record the delay in minutes for the indicated date. If the train is early, record the delay as negative. If the delay is given in hours and minutes, you need to convert it into minutes before recording.
  4. Change the date to a previous day and click Resubmit
  5. When you are done with the 300 train, change the train number to 22 and go through the cycle with the different dates.
  6. When you are done with the 22 train, change the train number to 324 and repeat the cycle of dates.

Entering the Information into Statdisk

When entering information into Statdisk, ignore any missing data. Do not put blank rows in the Statdisk data. It is not important that the days match up horizontally.

  1. Label three columns with the names of the trains.
  2. Enter the delays for each train in the appropriate columns

Summarize the Delay Times (part c)

  1. Choose Data / Descriptive Statistics
  2. Click Evaluate to find the statistics for the first train
  3. Change the column to 2 and click evaluate. Record the statistics for the second train.
  4. Change the column to 3 and click evaluate. Record the statistics for the third train.

There is no easy way to combine the numbers using Statdisk. The best way is to retype all the data in a new column and then describe that column. Minitab is once again more powerful.

ANOVA table (parts d - g)

  1. Choose Analysis / One-Way Analysis of Variance
  2. Double check to make sure the proper columns are selected (it defaults to the first three, which is what we want)
  3. Click Evaluate
  4. Copy the results into the ANOVA table. Notice that the order of the columns is different than what is on your worksheet.

The MS(Total) value does not appear in the ANOVA table output in Minitab as it is not technically part of the ANOVA. However, find it by dividing the SS(Total) by df(Total).

The test statistic and p-value are the F and p-value values from the table.

The output also contains the critical F value, but that is not part of the table.

Go to the Math 113 technology project page.

Go to the Math 113 homepage.

Last updated August 29, 2006 3:09 PM