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