Stat 1000: Tips for Web Assign HW 01
Published: Tue, 01/18/11
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Tips for Web Assign HW 01
When working with Web Assign, always enter the answer to one specific box and then click "Submit Answer" to confirm that is correct before you move on to another box. Do not enter several answers all at once in several boxes before you click "Submit Answer". You risk being marked wrong due to some typo or something.
For some strange reason, JMP 8 occasionally computes wrong answers even if you have copied and pasted your data correctly. I suggest that, if it is feasible, type the given data into your calculator (in Stat mode as shown in Appendix D of my book), and have your calculator compute the sample mean. Compare that answer with JMP's answer for the sample mean. If they are the same, everything is fine. If they are not the same, close JMP 8 and restart it, recopy and paste the data, and check again. Sometimes you have to do this 2 or 3 times before JMP finally works. If it is not feasible to use your calculator to compute the sample mean, have JMP do the question 2 or 3 times, being sure to restart JMP and recopy the data each time, and confirm that JMP gives you the same answer each time before risking entering the results into Web Assign.
For the JMP 8 part of the assignment, here are some tips:
Once you have installed JMP 8 and opened it, you are shown a menu with various buttons to click. You will almost always click "New Data Table" to enter new data. In the rare event they have given you a JMP file with the data already entered in it, you will simply open that file which would probably already open JMP for you. If you happen to enter data in yourself and save the file (a good idea), you can select "Open Data Table" to open up the saved file.
To copy and paste data into JMP: First, of course, select and copy the given data set. Now, open JMP and click "New Data Table". In the toolbar at top select "Edit" then "Paste with Column Names". That pastes all the data in and names the column appropriately.
Note, you must save your document as a PDF file to upload it into Web Assign (no other format will be accepted). If you don't know how to do this for the software you are using try the help files or Google "save as pdf file" for some helpful steps or programs that enable you to save documents that way for free. MS Word 2007 is capable of saving as pdf. If you are using a different program and do not have a "save as pdf" option, download the "pdf writer" they give you in Web Assign or Stats Portal. If you are unable to "save as pdf", try selecting "print" as though you were going to print your file, then select your "pdf printer" rather than your physical printer in the print options. That will then save your file in pdf form.
If you are taking the course by distance/online (Section D01) click here to see your tips for HW 01.
Study Lesson 1 in my study book (if you have it) to learn the concepts involved in HW 01.
Anytime a question wants you to "fill in the blanks" with key vocabulary terms, go to the appropriate section of your textbook (remember you have an online version of the textbook in Stats Portal if you selected the electronic option on your book list), and you will find the exact sentence they are giving you with the obvious word they want you to type in.
Question 4 (the Winter Olympics medals question):
You will have to enter the data manually into JMP. Click "New Data Table" to enter new data.
To enter data into JMP manually: Click "New Data Table" and you are automatically taken to an empty spreadsheet with one column. If you ever need two or more columns, simply double-click the space to the right of "Column 1" to create "Column 2". You can repeat this to create "Column 3", etc. You can then type in the data, using "enter" or "tab" or your arrow buttons on your keyboard to move from one cell to the next.
In this particular question, double-click "Column 1" and name it "Year". Click OK. Double-click the space to the right of Column 1 to create Column 2. Name that column "Number of Medals". Type in the data you have been given.
To make a Time Series: Select Analyze in the toolbar, then select Modeling in the drop-down list and finally select time series. Select your time variable and click X, Time ID and select your variable you are tracking and click Y, Time Series. Click OK. Just ignore that other pop-up menu asking about time lags or autocorrelations or whatever, click OK and move on. None of that has anything to do with the time series.
To get rid of any outputs you don't want to copy and paste, click the red triangle and deselect the unwanted things.
Question 5 should be done manually. Note to enter the answers correct to 0.1, they mean round your answers off to one decimal place.
Question 6 (back-to-back stemplot question):
Note that they have given you numbers in thousands of dollars so, for example, 127 is 127 thousand dollars. They want you to round off to the nearest $10,000, so 127 would be rounded to 130 thousand dollars. Then you would ignore that 0 at the end. 130, would be trimmed to 13. We know this is in tens of thousands of dollars, so 13 actually means $130,000. When we make the stemplot, 13 would mean the stem is 1 and the leaf is 3. Similarly, 396 thousand dollars would round to 400 thousand dollars, trim the last 0, to read that as 40, giving you a stem of 4 and a leaf of 0.
To type in the back-to-back stemplot they request, use the vertical line on your computer keyboard to separate the stem from the leaves ("SHIFT \" will give you "|"). Don't worry if your columns don't end up perfectly lined up, just do the best you can. Be sure to label the first line in your stemplot something like
"Neigbourhood A Leaf | Stem | Neigbourhood B Leaf",
then enter all the stems and leaves row-by-row underneath.
Question 7 should be done manually.
Click the link to the data file, then select and copy the entire data set (you can click "Ctrl A" on your keyboard to select all, then click "Ctrl C" to copy it all). Having opened a "New Data Table" in JMP, select "Edit" then "Paste with Column Names" to paste the data in. Double-click the "iq" column name at top and confirm that JMP has the "Data Type" as "Numeric" and the "Modeling Type" as "Continuous", changing those settings in the drop-down list if necessary. Click OK. Do the same for the "gpa" column. Important: Double-click the "gender" column and make sure that JMP has the "Data Type" as "Character" (it probably doesn't) and the "Modeling Type" as "Nominal" (it probably doesn't), changing those settings in the drop-down list if necessary. Click OK. Finally, take a look at the last row of data that has been pasted into JMP. If it just shows a bunch of dots instead of numbers, click that row to highlight it then right-click and select "delete rows" to delete that row. Of course, do not delete any row that has numbers (data) in it!
To find the mean, standard deviation and median in part (a):
Select "Analyze" then "Distribution". Highlight "iq" in the pop-up menu and click the "Y, Columns" button. Click OK. You are then taken to a screen that shows a histogram among other things. You will find the mean and standard deviation in the "Moments" section and the median in the "Quantiles" section.
To make the boxplots and histogram in part (b): In the toolbar at the top of your data spreadsheet, select "Analyze" then "Distribution". Select the "gpa" column and click the "Y, Columns" button. Click OK. Your histogram appears sideways but they didn't ask you to switch it horizontally, so don't bother. If they want to see it the typical way (and they will request that if they want it), click the red triangle next to your variable above the histogram and select Histogram Options from the drop-down menu. Select Horizontal Layout. Click the red triangle next to "gpa" and select "quantile boxplot" (if it isn't checked already) and "outlier boxplot" as well to get the desired boxplots. Click the blue triangles next to "Quantiles" and "Moments" to hide that stuff, then "select all" (click "Ctrl A" on your keyboard) and then "copy" (click Ctrl C). Paste it into your document. Be sure to type in your answers to the question they ask in part b underneath the graphs you pasted into your document. Remember how skewness and/or outliers affects a mean and median.
To make the side-by-side boxplots in part (c): Back in your data spreadsheet, select "Analyze" then "Fit Y By X". Highlight "gpa" and click "Y, Response". Highlight "gender" and click "X, Factor". Click OK. Now click the red triangle and select "Display Options", then select "Box Plots" to get your side-by-side boxplots. Select all and copy and paste into the same document you already have in part (b). Make sure you type your answer to their question below these boxplots in your document. You can now save the file and upload it into Web Assign.
Question 9 should be done manually. Be sure to read Appendix D at the back of my book to learn how to use Stat Mode in your calculator to compute a mean and standard deviation quickly. Read my section in Lesson 1 on "The Effect of Changin Units on Centre and Spread" to properly prepare for the last part of this question.
Study Lesson 1 in my study book (if you have it) to learn the concepts involved in HW 01. This lesson will also set you up for HW 02.
Ignore any references to JMP 6SE or Crunchit!. You are using JMP 8 in this course. The assignment is just an old assignment that they forgot to update. Use JMP 8 anytime they tell you to use computer stuff.
Anytime a question wants you to "fill in the blanks" with key vocabulary terms, go to the appropriate section of your textbook (remember you have an online version of the textbook in Stats Portal if you selected the electronic option on your book list), and you will find the exact sentence they are giving you with the obvious word they want you to type in.
To type in the split stemplot they request, use the vertical line on your computer keyboard to separate the stem from the leaves ("SHIFT \" will give you " | "). Don't worry if your columns don't end up perfectly lined up, just do the best you can. Be sure to label the first line in your stemplot "Stem | Leaf", then enter all the stems and leaves row-by-row underneath.
For the JMP 8 part of the assignment, here are some tips:
Once you have installed JMP 8 and opened it, you are shown a menu with various buttons to click. You will almost always click "New Data Table" to enter new data. In the rare event they have given you a JMP file with the data already entered in it, you will simply open that file which would probably already open JMP for you. If you happen to enter data in yourself and save the file (a good idea), you can select "Open Data Table" to open up the saved file.
To copy and paste data into JMP: First, of course, select and copy the given data set. Now, open JMP and click "New Data Table". In the toolbar at top select "Edit" then "Paste with Column Names". That pastes all the data in and names the column appropriately.
Click the link to the data file, then select and copy the entire data set (you can click "Ctrl A" on your keyboard to select all, then click "Ctrl C" to copy it all). Having opened a "New Data Table" in JMP, select "Edit" then "Paste with Column Names" to paste the data in. Double-click the "tuition" column name at top and confirm that JMP has the "Data Type" as "Numeric" and the "Modeling Type" as "Continuous", changing those settings in the drop-down list if necessary. Click OK.
To make a histogram: In the toolbar at the top, select Analyze then select Distribution. Select the "tuition" column and click the "Y, Columns" button. Click OK. Your histogram appears sideways. If they want to see it the typical way (and they will request that if they want it), click the red triangle next to your variable above the histogram and select Histogram Options from the drop-down menu. Select Horizontal Layout.
Question 10 (the pole-vault question):
You will have to enter the data manually into JMP. Click "New Data Table" to enter new data.
To enter data into JMP manually: Click "New Data Table" and you are automatically taken to an empty spreadsheet with one column. If you ever need two or more columns, simply double-click the space to the right of "Column 1" to create "Column 2". You can repeat this to create "Column 3", etc. You can then type in the data, using "enter" or "tab" or your arrow buttons on your keyboard to move from one cell to the next.
In this particular pole-vault question, double-click "Column 1" and name it "Year". Click OK. Double-click the space to the right of Column 1 to create Column 2. Name that column "Height". Type in the data you have been given.
To make a Time Series: Select Analyze in the toolbar, then select Modeling in the drop-down list and finally select time series. Select your time variable and click X, Time ID and select your variable you are tracking and click Y, Time Series. Click OK. Just ignore that other pop-up menu asking about time lags or autocorrelations or whatever, click OK and move on. None of that has anything to do with the time series.
To get rid of any outputs you don't want to copy and paste, click the red triangle and deselect the unwanted things.
To copy and paste the parts you do want, select the icon on the JMP toolbar that looks like a fat white plus sign "+" (the Selection tool). You can then click various parts of the printout to select the sections you want. Copy and paste into Word or something like that. Alternatively, you can also click the blue triangles to make certain parts of JMP's output disappear. You can then "select all" (Ctrl A) to select the remaining parts that you do want to copy.