2. What am I supposed to email to the instructor?
3. When are the case studies due?
4. What do the numbers on the left of my stem-and-leaf mean?
5. How do I create a group table for discrete variables?
6. How
do I create a group table for continuous variables?
7. How
do I make a modified box plot?
8. How
can I use Minitab to generate factorials?
9. What
is meant by the questions regarding “Assumptions”?
10.
How do I make a histogram for grouped (frequency) data?
11. How can I use a normal (z) score to find probability?
12. What are the grading criteria for the course?
13. How do I get a MACRO to run?
14. How to I modify a histogram to match a
frequency table?
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You syllabus is contained on the floppy disk you were given at the start of the semester. There is a file called “Syllabus.doc” which is saved as a Microsoft Word document
2. What am I supposed to email?
There are three “case studies” or “projects” that need to be completed. You are to place the answers to the questions into a Microsoft Word document, using Minitab to process the information when necessary. You will also present your findings to the class using Power Point. This “Word” document and a copy of the Power Point presentation are then attached to an email message that you send to the instructor.
3. When are the case studies due?
The case studies are due before the starting time of the class on the date specified on the last page of your syllabus. Late case studies will receive a 10% reduction in points for each weekday it is late. Case studies four or more days late receive zero credit.
4. What do the numbers on the left of my stem-and-leaf mean?
The far left column on Minitab’s stem-and –leaf represent cumulative counts. The “center” number will be inside of parentheses. This number is the count of how many entries are on the line that contains the middle observation (median). The numbers above and below are called the “depths” and count the entries from the “outside” to the “inside”. Above the median, the depths indicate how many entries are on that line or above. Below the median they represent how many entries are on that line or below.
5. How do I create a group table for discrete variables?
You can use the “tally” command on the appropriate column. STAT è TABLES è TALLY. Double click on the appropriate variable or column. Select counts and/or percentages. Click OK.
6. How do I create a group table for continuous variables?
You will need to use the “group.mac” macro. Click in the session window. Then click on EDITOR and ENABLE COMMANDS. The MTB> prompt should appear. At the prompt, type “a:\group.mac c1” (without the quotation marks). This assumes your a: drive contains the macro disk and the column you want to group is c1. You will be given three options on how to group the column.
7. How do I make a modified box plot?
This is the default type of box plot for Minitab. Click GRAPH è BOXPLOT. Double click the variable and then OK. You can change the shading and colors in ATTTRIBUTES and the method of grouping under OPTIONS.
8. How can I use Minitab to generate factorials?
Minitab has a GAMMA function that works similar to factorials however you must type in on number larger than you want the factorial of. For instance if you want 4! you would need to select GAMMA(5).
9. What is meant by the questions regarding “Assumptions”?
Assumptions are the “requirements” or “characteristics” of a particular item. For instance, a binomial experiment has certain assumptions that must be true to be considered binomial. These assumptions are typically shown in your text within pink (procedure) boxes.
10. How do I make a histogram for grouped (frequency) data?
Minitab does not expect data to be summarized or grouped, and therefore is not geared to graph this type of data under the histogram option. However, you can still graph summarized data by using GRAPH è CHART. Under Function select SUM. In the y column select the frequency (count). In the x column select the actual variable. To make the bars “touch” select ATTRIBUTES, scroll to the right and set the bar width to “1”.
11. How can I use a normal (z) score to find probability?
To find the probability of obtaining an x score between two
boundaries such as P(2.34<x<3.27), first convert each boundary (x) into a
z-score using z=(x-mu)/sigma. Find the
corresponding areas for the two z-scores in a z-table. Then subtract the areas. You can also find the areas using Minitab’s
normal probability function. Click CALC è PROBABILITY DISTRIBUTIONS è
12. What are the grading criteria for the course?
The course grade is determined by 2 case studies worth 100 points each and a third case study worth 200 points. There are also discussion questions that will be worth another 100 points during the semester as well as 100 class participation points. The total number of points available for each student is 600. The course grade (percentage) will be found by dividing the points accumulated by the number 6.
13. How do I get a MACRO to run?
Minitab must be set to accept commands from the session
window. First make sure the proper
worksheet was the last worksheet opened.
Then click in the session window or on its title bar at the top. Next click on “Editor” to get the drop down
menu. Click on “Enable Commands” and the
MTB> prompt will show up in the session window. Now you can run the macro of your choice from
your CD or any other available drive.
For instance, you can type:
MTB>
%e:\group.mac C3
to run the “group” macro on column 3.
Note that the percent sign “%” must be the first character of the
command and that “e:” represents the drive letter where the macro is stored.
Note: This information is also contained in a file
called “Macros.doc” that is also on Blackboard.
14. How to I modify a histogram to match a
frequency table?
To make the
histogram "match" a frequency table (specify where the boundaries for
the bar fall), you need to make some changes under "options". The type of boundary needs to be set to
"cutpoint". Instead of using
the "automatic" selection, you need to specify that the histogram is
to go from “min” to “max” using “steps”.
For instance to make the histogram run from 4 to 20 in steps of 2, you
would type in the bottom box: 4 : 20 / 2.
You should also add some color and/or shading to the graph.