Math 151 , Spring '08, Day 4, Mon., Feb.4 After class, Hit reload to get most current version

HW assignment  Day4  (From Moore unless otherwise noted.)
(Re)Read Ch.2 thru p. 47. Do "check" p. 56, 2.13, 14, 16 (mean/median), and(ahead) 2.15,17,18 (5#summary/boxplot). Read 53-55, "Organizing...". Ahead: Finish Ch. 2. ("check" 2.19 (don't calculate. It's not #a), 20, 21, 22)

Hand in Wed.:  (note, the  problems are copied from Day 3 (postponed).  Label them Day 4.
p.14, 1.7 Revisting histogram: histogram bins: Use applet at  http://www.whfreeman.com/bps4e, as in class last time.  Help.

p. 35, 1.43 Orange prices timeplot
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Ch. 2
p.39, 2.1 Wood, mean Punch the 20 actual values into your calculator, adding and dividing by 20. 
A.  Find the (approximate) median for the data on Wood breakage, using the numbers in the stemplot on p. 21 (Fig.1.10.)  It's approximate because the stemplot data is rounded--Quick and Dirty is often sufficient!

p. 41, 2.4  Bonds Home runs Make a stemplot to put the numbers in order to find the medians.  For the means, just punch them in. (You can shorten the work by finding the sum of the 18 years excluding the 73, writing that down, and then adding the 73 to get the total for the 19 years.  Then divide the appropriate sums by 19 and 18.)
p. 41, 2.3,  p. 57, 2.23, 2.24  mean or median?

p.39, 2.1 Wood, mean Punch the 20 actual values into your calculator, adding and dividing by 20. 
A.  Find the (approximate) median for the data on Wood breakage, using the numbers in the stemplot on p. 21 (Fig.1.10.)  It's approximate because the stemplot data is rounded--Quick and Dirty is often sufficient!  Keep a copy for #2.5, which will be assigned soon.

p. 41, 2.4  Bonds Home runs Make a stemplot to put the numbers in order to find the medians.  For the means, just punch them in. (You can shorten the work by finding the sum of the 18 years excluding the 73, writing that down, and then adding the 73 to get the total for the 19 years.  Then divide the appropriate sums by 19 and 18.)
A.  Using the Handout: Wages in our region:  How are the occupations organized (Clearly not alphabetically). For what occupations is the wage scale probably skewed left?  (Marker:  mean is less than median.)   For what other occupations is the skewness not too extreme (Mean no more than about $1000 greater than median)?  
p. 41, 2.3,  p. 57, 2.23, 2.24  mean or median?

- - - Postpone the rest (quartiles, 5#summary etc.)- - -
p. 58, 2.29 fruit eating
p. 58, 2.30 newborns.  (I said I wouldn't make you make a histogram, but the data's already pre-binned, so do it here.) Also Describe the distribution--symmetric, skewed?
p. 58, 2.28 U. endowments.  They mean, what do you have to count in to, in the list, to locate the mean and quartiles?

p. 59, 2.34 guinea pigs survival:  For a) use the One Variable Statistical Calculator Applet at  http://bcs.whfreeman.com/bps4e   or on your text's CD (If you have an older, used book, it may be  in the datasets as if for BPS3e; ex02-23.dat).  Just observe the skewness.  For b), find the 5-number summary (easy since they're in order in the book), check your answers with the Applet results.  Draw the boxplot and compare with the histogram on your screen.  (with or without outliers, I don't care.)
p. 45, 2.5 Wood again. Go ahead and use the stemplot figures to find the quartiles.  Also make a boxplot.
p.58, 2.27 Flower length: Find the 5-number summary for bihai, from the stemplot p. 55. If you want more practice, do the other 2 by hand also, but you may just use the numbers from the answers in the back of the book.  Use them to make 3 side by side boxplots, and finish the problem as written.

"Read," to discuss (be able to answer in class)
p.34,1.40 coins (skewed left)


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Ch. 2
p. 57-8, 2.25 Dr's salaries.  Look at the answers in the back for the mean and median.
 
 

p. 58, 2.26 Resistance, with Applet
 http://bcs.whfreeman.com/bps4e  Or use CD from book.  Choose "Statistical Applets",Mean &Median. Also, add more points (up to 50 total). Check out symmetric,  skewed, distributions with outliers.



Optional 
play, with Applet)
P. 59, 2.32 (mean/median play, with Applet)
p. 63, 2.42, 43 (more play, with pencil)




Sign in on the clipboard. Sign up to see me in my office if you haven't.  Find someone you don't know and introduce yourself.  Introduce yourself to at least one person you know, in case they've forgotten who you are.Note Class members is up.  Check that you're correct.
Compare HW with others, tell me unanswered questions.
Handing back Pretests
MathClinic (Mac 120) hours:  Matthew  Peddle Today, Mon. 1:30-3:30pm,  Friday 1:30-3:30pm
Turning in HW out of class:  NOT Campus Mail!  Into 151 box outside my door, into yellow folder if it's there.
Handout: Wages in our region: (Missed class?  Extras in white folder outside my door, Mac 102)

Notes, Day 3
See Day 3 to see where we got to. Hit reload to see updates.
Next: Review median. Quartiles, 5#summary and InterQuartileRange, Boxplots.

Standard deviation.


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